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Теория(История о возникновении Электрического поля,Опыт,Магнитный поток,Правило Ленца,Закон Фарадея,Формула Томсона,Конденсаторы,Энергия Конденсаторов)

1:05:33

Задание 1

1:07:25

Задание 2

1:12:04

Задание 3

1:13:21

Задание 4

1:15:11

Задание 5

1:18:21

Задание 6

1:21:52

Задание 7

1:23:26

Задание 8

1:25:28

Задание 9

1:28:48

Задание 10

1:31:50

Задание 11

1:34:16

Задание 12

1:42:00

Задание 13

1:47:21

Задание 14

1:50:57

Задание 15

1:55:03

Задание 16

1:56:40

Задание 17

2:00:02

Задание 18

2:02:26

Задание 19

2:06:45

Задание 20

2:07:39

Задание 21

2:09:54

Задание 22

2:11:21

Задание 23

10 класс - Обществознание - Правовые основы антитеррористической политики Российского государства

10 класс - Обществознание - Правовые основы антитеррористической политики Российского государства

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Обитель на Сторожах ( Саввино - Сторожевский монастырь )

Обитель на Сторожах ( Саввино - Сторожевский монастырь )

эбонит

2022

веб

68

магнитный

поток

тестовые

задачи

00:00:17

hello friends, I'm

00:00:19

sorry, please, I'm a little

00:00:21

late,

00:00:23

I had compelling circumstances, I wanted to

00:00:27

eat,

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I called and now we're planning to take it away since there's

00:00:35

sound, there's sound, I have it,

00:00:45

why am I early so that I can

00:00:51

return to the apartment after the streams and

00:00:54

deal with the moving there, in

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short, the wife's got brains. and

00:00:59

forced me to reschedule even the stream earlier,

00:01:01

well, of course I wouldn’t have rescheduled it, but

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damn you can’t come to an agreement with these women

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5 squat lateness

00:01:14

what can you do

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even nice

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everything

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everything

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rehabilitated

00:01:32

tags

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don’t hide the push-up then

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today about 2 hours but no more than

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twenty-two hours 20 minutes because that

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I have 30 types of the next stream,

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so we need to start already, let’s

00:01:59

take extra time, what they tell the

00:02:02

backstory of this bike in general,

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they discovered, well, Oersted will discover that the

00:02:09

electric field is connected to the magnetic

00:02:12

field, that the

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current flowing through the wire creates a vector of

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magnetic induction and they began to think

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Is it possible and

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is it possible to do the opposite so that

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changes

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like here a magnet of magnetic induction

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creates a current and 2 scientists worked on it

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in parallel

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1 ampere

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another faraday and

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what they did

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they took this

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device ammeter then the ammeters were

00:03:03

quite sensitive there were separate ones for them

00:03:06

rooms

00:03:08

were created in which from the

00:03:11

ammeter room, now we have

00:03:13

such an intermeter, but now you can

00:03:17

use it however you want, your phone here

00:03:19

is a super computer at hand, what can we

00:03:22

say about the ammeter then this is just the

00:03:25

room there was an ammeter room and

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in one room and he had a coil in

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another room, an ammeter, and since the ampere was

00:03:36

very worried that someone was sleeping in his room,

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his discovery, no, he didn’t take an

00:03:41

assistant because then he had to get a percentage and

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unfasten the [ __ ] off to sue, but

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Faraday didn’t fall for it about

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him there this

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damn guy, some military guy, why did

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he help

00:03:57

carry out experiments and what did he do, that

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is, look, he’s here, here’s an approximate

00:04:06

setup of what this experiment looked like,

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so he took it from, so he

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stuck

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the marriage, he stuck it, then he went into another room and

00:04:25

looked at what a centimeter doesn’t suck didn’t

00:04:27

happen, what

00:04:31

if in the other room, uh, glad this

00:04:34

ampere was like that, and in Faraday’s

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room there was a general, a real

00:04:41

lieutenant colonel, and you won’t see it very much now,

00:04:44

probably not very noticeably,

00:04:47

give it to another camera with the key,

00:04:56

look, I have this here, heroin

00:04:59

I’m now going to stick a magnet into it and

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the arrow begins to oscillate a little,

00:05:08

you see,

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well, naturally he began to study this

00:05:17

phenomenon, and when I’m in sadness, let’s

00:05:19

better make it blue

00:05:25

when he

00:05:27

when I insert it, the arrow in one

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direction and when pulled out, the arrow

00:05:32

deviates in the other direction

00:05:34

but we’ll talk about this later,

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it can be observed in a

00:05:41

slightly different way,

00:05:44

look with the help of a magnetic needle,

00:05:51

here we have a magnetic needle,

00:05:58

which, but according to the magnetic field of

00:06:01

the earth, this is how they are located now, if

00:06:04

I turn on some current, I’ll

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turn on a small one, then this is an arrow

00:06:13

calm down dear,

00:06:17

then this arrow is generally

00:06:19

perpendicular to it, now it has something

00:06:21

crazy about it,

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calmed down, it is located

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perpendicular to this contour, but we

00:06:30

know by the right hand rule why this

00:06:32

happens, if the coil

00:06:34

changes, but

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current begins to flow, then a

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magnetic field arises induction and this can be

00:06:44

felt by the family, this magnetic

00:06:47

needle,

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let's now do things a little differently:

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I turn this on, I turn it off, now I

00:06:57

take this one and

00:07:01

connect it around the area in series or

00:07:04

in parallel, it doesn’t matter here, we just

00:07:07

connect these two coils together and

00:07:10

it turns out

00:07:13

when

00:07:16

when I will

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conduct a current into this conduct a magnet into this

00:07:23

coil,

00:07:25

then a current will flow along this circuit, we

00:07:29

already know, and since a current flows here, then a

00:07:34

magnetic induction vector will appear here, well, since a current flows and the

00:07:37

needle should oscillate, that is, I am right now with

00:07:39

these magnets I can influence the

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arrow that is here,

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let's check it directly

00:07:47

the arrow has fallen out,

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look now now disco

00:08:00

arrows

00:08:02

hop panic,

00:08:05

well, that's how I do it and when I enter it and

00:08:08

when I take it out when I enter it in one

00:08:12

direction when I take it in the other direction oh

00:08:15

yes

00:08:17

my arrow is spinning Well, you see,

00:08:20

in general, this is all,

00:08:27

such things are such experiments,

00:08:30

let’s now discuss how all this happens in general,

00:08:42

and in general, Faraday, together with his

00:08:48

military man, I already forgot what his

00:08:50

rank was, they discovered this this this

00:08:54

pattern that the changes are here

00:08:56

if move the magnet or pull it out, then a

00:08:59

current will flow, well, naturally,

00:09:01

naturally, this man who

00:09:04

helped him was your

00:09:06

general in this military man said just

00:09:10

a little bit now I saw the farads of the walls who I

00:09:14

saw like here and my experiment and

00:09:19

what are you doing there I was standing in my little room of the

00:09:23

ds effect induction I saw you didn’t

00:09:27

see [ __ ] this is my my discovery go [ __ ] yourself

00:09:31

but thank God in this case it was

00:09:35

not force that won, it was reason that won and this

00:09:38

law is called the law for a dm

00:09:40

but more about that a little later

00:09:44

so it’s not for nothing that the Abwehr he took on no one

00:09:47

as his assistants, well, and

00:09:50

anyway he was lucky, he had a bunch of

00:09:52

things named after him, so I

00:09:55

think we’re not offended by fate anyway,

00:09:59

so

00:10:03

their catch is the

00:10:05

stuffing, so let’s discuss what

00:10:11

happened,

00:10:12

that is, look at us

00:10:16

if there is some kind of closed circuit, but in

00:10:19

this case I have a coil, it could

00:10:21

just be some kind of

00:10:23

conductor through which current flows, and

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imagine that

00:10:32

at some angle the

00:10:37

magnetic induction vector of a uniform

00:10:40

field

00:10:42

penetrates this circuit, that

00:10:45

is this vector is called the

00:10:48

normal vector, the

00:10:50

normal is

00:10:57

perpendicular to the

00:11:06

plane,

00:11:10

well, that is, what perpendicular will be

00:11:14

to this tape but to the plane of the tape, this is

00:11:17

the vector that is

00:11:19

perpendicular to the plane of this tape, this is the

00:11:23

angle between the magnetic

00:11:26

induction vector and the

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normal vector and the magnetic flux

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will be called a value that

00:11:36

is denoted by the letter ef equal to the

00:11:40

product of magnetic induction by the

00:11:44

area of the contour and the cosine of the angle between

00:11:48

them. Well, on the other hand, if you and

00:11:52

I multiply b by cosine alpha,

00:11:58

look here we have b to b by cosine

00:12:01

alpha, this is the component b that is

00:12:04

perpendicular to the vector magnetic

00:12:07

induction, that is, it could also be

00:12:10

perpendicular, you can designate this, you can also

00:12:13

write this formula in the following form:

00:12:16

magnetic induction

00:12:19

perpendicular to the plane, I will multiply the

00:12:22

projections of the magnetic induction

00:12:23

perpendicular to the plane and multiply by

00:12:27

the area, the

00:12:28

magnetic flux of the elections is measured,

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this means Weber, and

00:12:39

it turns out when we

00:12:44

dumped like this magnet into this circuit and pulled out

00:12:47

of it, we changed the magnetic flux, well,

00:12:51

it’s clear that the monique for magnetic

00:12:53

induction increases when I

00:12:55

pull this magnet out here and it

00:12:57

decreases;

00:13:16

magnetic

00:13:19

flux

00:13:20

comes leads to the emergence of an

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induction current

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that will be directed in such a way as

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to prevent a

00:13:30

change in the magnetic induction so that the

00:13:33

magnetic induction that is created by

00:13:35

this current

00:13:37

prevents any change, that

00:13:39

is, what does the

00:13:42

circuit do, he does not like change, he is a

00:13:46

conservative,

00:13:48

that is, it flows through him,

00:13:51

imagine what it is the rain

00:13:53

hits from top to bottom, that's when

00:13:56

the rain hits in one direction, but he seems to be

00:13:59

happy with it, he likes it when everything was the

00:14:02

same as it was before, if suddenly the rain

00:14:04

starts pouring harder, then he begins to

00:14:08

resist this change and he

00:14:10

tries to create a current here in such a

00:14:14

direction as to prevent to this

00:14:15

increase in current strength, that is, look

00:14:19

now with a specific example, I’ll show you,

00:14:20

imagine that we had rain beating

00:14:23

from top to bottom, beating from top to bottom with a constant

00:14:27

value, everything was fine, then we

00:14:30

began to increase we are increasing the

00:14:34

magnetic induction, it

00:14:36

turns out that the current should flow and start

00:14:40

flowing in this way so that the magnetic

00:14:43

induction that creates the current in the circuit

00:14:46

prevents this, do not give it

00:14:48

magnetic induction with an index and

00:14:50

is designated, it means the current flows like guys

00:14:54

if this is the part closest to us and this is the

00:14:56

farthest part in which direction if you look from

00:14:59

above clockwise or counterclockwise

00:15:02

what do you think if this

00:15:04

increases magnetic induction, it

00:15:06

turns out that it must resist in which

00:15:09

direction we need to send the current if

00:15:11

we look from above clockwise or counterclockwise,

00:15:27

yes, that is, look, well, according to the right

00:15:30

hand rule, so that the

00:15:34

magnetic induction that is created by

00:15:37

this induction current is directed

00:15:40

downwards, inhale we must put it in this

00:15:42

side,

00:15:43

well, that is,

00:15:45

clockwise,

00:15:47

the correct answer is clockwise,

00:15:51

it’s clear guys, but

00:15:55

if, under the same conditions,

00:16:05

magnetic induction

00:16:10

begins to decrease and

00:16:14

decrease,

00:16:16

then the magnetic flux would like to be strengthened,

00:16:21

that is, if it decreases, it creates a

00:16:24

current in such a direction as to strengthen the

00:16:27

iceq would already in this direction the

00:16:31

induction current

00:16:37

in this case it would give if

00:16:40

viewed from above it

00:16:41

would flow

00:16:44

counterclockwise

00:16:49

so well, let's write down the

00:16:51

Lenz rule and Faraday's law directly, the

00:16:58

induction current is

00:17:03

the rule of years, it is clear that the Lenz rule the

00:17:12

induction current

00:17:20

has a

00:17:24

direction

00:17:36

in which

00:17:40

it the

00:17:45

magnetic field

00:17:57

prevents the

00:18:06

reasons that cause it to increase,

00:18:18

actually speaking, I ca

00:18:25

n’t find you for a watch

00:18:28

[music]

00:18:38

it’s clear in general how the

00:18:41

magnetic flux can change;

00:18:44

magnets, the flux can change either if

00:18:47

we change the vectors of magnetic induction, as

00:18:50

I showed here, that is, the rain hits harder from

00:18:53

bottom to top, weaker the rain beats

00:18:55

from bottom to top how else

00:18:58

how else can you

00:19:01

change

00:19:03

change the magnetic flux guys write

00:19:06

please

00:19:20

will teach the first

00:19:22

b

00:19:24

decrease and increase

00:19:25

[music]

00:19:28

increase

00:19:31

change the angle and change the area that is, everything

00:19:35

that is here you and I can change

00:19:37

how we can change the flesh, well, understandable

00:19:40

The thing is that I won’t squeeze a coil like this,

00:19:42

there’s no point in it, it’ll

00:19:45

only get damaged, you can take

00:19:47

some kind of cord,

00:19:57

let’s say you take the cord,

00:20:00

it was essentially behind the circuit and

00:20:03

there you connect it to yourself,

00:20:07

twist it about there a number of times

00:20:10

you’re here this type of coil

00:20:13

turns out to be

00:20:19

switched and that I can

00:20:22

change the flow, I can take and

00:20:26

reduce the area, that is, there was such

00:20:28

flesh, then I took it like this and did it and

00:20:30

if I connected an ammeter here, then the

00:20:34

prize would be and take some kind of magnet 6 I

00:20:38

’ll take magnet question for an example,

00:20:44

well, it doesn’t matter, in short, imagine that I

00:20:46

am a magnet, now

00:20:48

I’m blowing magnetic induction on

00:20:51

this right

00:20:53

now, a large magnetic flux passes

00:20:56

through this circuit,

00:20:58

then I squeezed like this, the area

00:21:01

decreased to virtually zero and the

00:21:02

magnetic flux decreased sharply,

00:21:04

it’s clear that here the counter

00:21:07

current will begin to flow along this circuit and

00:21:09

another way in which I can change the

00:21:12

magnetic flux is to rotate

00:21:14

this circuit like this, you understand, and the current strength

00:21:19

which is like this 2 is to change the area like this

00:21:24

and the

00:21:27

third way is to

00:21:30

rotate

00:21:33

with some angular velocity here this

00:21:36

coil rotates and an

00:21:39

induced emf arises in connection with this, I’ll even

00:21:43

try to show you

00:21:44

an experiment now, it’s

00:21:45

quite interesting

00:21:47

now if they find what they

00:21:50

need to

00:22:02

find, a magnet was also

00:22:15

just used by a large

00:22:19

magnet like this and like

00:22:34

this, look at

00:22:39

more experiments at night look,

00:22:43

I have a battery

00:22:48

with which I connected these little

00:22:50

pieces of iron and twisted them, I also have

00:22:53

this coil

00:22:56

that consists of a change, it turns out that it has

00:23:04

oxidized into its surface, so it’s

00:23:06

so yellow, so it seems to you that it’s

00:23:08

turning yellow now at the moment

00:23:11

its surface is not conducts electricity

00:23:14

that I can make

00:23:16

some part of it conduct

00:23:17

electricity, I just

00:23:20

sand one bottom surface

00:23:24

here and here and

00:23:32

here I clean it, that is, I will clean it, that is,

00:23:37

look at my bottom side, the bottom

00:23:40

side is conductive and when will my crap

00:23:44

be being in this position

00:23:45

the watch is suspended conducts current, this

00:23:48

upper side is non-conductive in this

00:23:50

state it will not conduct current

00:23:52

now I insert this one here

00:24:00

now nothing happens but nothing

00:24:02

interesting, yes,

00:24:04

that is, either current flows through it or it does

00:24:07

not flow, but look when a current flows through it,

00:24:09

it turns into a magnet, when

00:24:12

no current flows through it, it ceases to be a

00:24:15

magnet and

00:24:17

due to this we will

00:24:21

have a cool effect

00:24:23

look now you will see now in the answer the

00:24:27

hour it starts

00:24:32

firewood you see it’s gone, that is, it turns out that

00:24:36

it conducts magnetic in one position

00:24:39

current in another position does not conduct and

00:24:43

it is a magnet oriented in one

00:24:47

direction that turns a magnet

00:24:49

oriented in the other direction and

00:24:54

due to this, such a rotation is obtained

00:25:03

here,

00:25:10

well, it’s clear in general that it wasn’t me who

00:25:12

spun it,

00:25:15

in general, due to the strength of the current

00:25:18

there are batteries and I translate this force

00:25:22

into mechanical movement of this

00:25:25

crap,

00:25:26

so let’s all

00:25:34

show you how this happens,

00:25:39

my battery has

00:25:46

these rings here and

00:25:51

I have 2 parts of

00:25:58

this coil, 1 conductive, the other non-

00:26:01

conductive, let’s

00:26:07

imagine that the bottom one is conductive,

00:26:13

that is, here it has a coil

00:26:17

in the lower position, it conducts current and

00:26:21

receives current in this position,

00:26:24

current flows through it and

00:26:28

it turns into such a magnet, yes, there is

00:26:31

a magnet there,

00:26:34

and

00:26:37

when it turns over in the other

00:26:40

direction, it begins to be repelled due

00:26:43

to some initial unwinding

00:26:45

when it turns over in the other

00:26:47

direction, then the current no longer flows through it and

00:26:52

it does not get stuck in one position, that

00:26:55

is, if it was PR on all sides, it was sharpened

00:26:57

on you just like that, somehow

00:26:58

it pushed off and all through it the boutique

00:27:01

became like this in one position and

00:27:03

here it doesn’t stop, but by

00:27:05

inertia it continues to scroll,

00:27:07

scrolls to this position again

00:27:09

turns into a magnet and

00:27:11

is repelled again, and due to this, we

00:27:14

get this effect

00:27:18

[applause]

00:27:20

because one is oxidized, so it does

00:27:23

n’t conduct, and I cleaned the other with sandpaper,

00:27:26

so it conducts

00:27:40

tags

00:27:42

well, okay, in general, we talked about this,

00:27:50

now let's discuss Faraday's law

00:27:54

directly, what is equal to

00:28:03

what is equal to, and ds of induction that

00:28:06

creates this induced current,

00:28:08

according to the port version, dice induction coincides

00:28:13

with the induction current, but in fact

00:28:15

this is not so and

00:28:21

ds of induction is the law Faraday let's

00:28:25

write down Faraday's law, that's

00:28:28

who we were talking about

00:28:32

equals minus f prime from

00:28:36

t

00:28:38

why minus this minus is like a

00:28:41

consequence of Lenz's rule that is, if

00:28:45

you have a magnetic flux

00:28:48

in this direction increases

00:28:51

tds induction will be directed so as to

00:28:55

prevent its increase therefore

00:28:57

here a minus appears, but in everyday life we

00:29:00

will put a dick on this minus just

00:29:04

like in Hooke’s law and we will simply write

00:29:08

delta f, but there the module from f is a prime from t

00:29:12

because we will choose this direction

00:29:14

ourselves according to the

00:29:17

right hand rule there and the Lenz rule

00:29:19

here

00:29:22

now

00:29:24

this is if we have some kind of

00:29:27

variable field that is unevenly changing,

00:29:30

well, what example can be let's say f

00:29:33

is equal to

00:29:36

b.s. and here, just like I have now,

00:29:39

this vodka and wine rotated with

00:29:41

some angular velocity omega n, that

00:29:44

is, this angle is constantly changing,

00:29:47

and in this case we need to use the

00:29:49

derivatives in this case ds of

00:29:51

induction

00:29:53

equals there was minus sine omega-3

00:29:59

is a complex function multiplied by

00:30:01

omega,

00:30:02

let us see there another minus

00:30:06

appears by the way, yes, ds of induction minus the

00:30:10

derivative of the magnetic flux, that is, it

00:30:13

turns out, let me rewrite the

00:30:15

b.s. omega sine omega tv

00:30:20

in this case, what kind of induction bds

00:30:23

was there, but the case is if we have a uniform

00:30:27

magnetic flux changing,

00:30:29

if uniformly

00:30:35

let's say magnetic induction

00:30:37

increases over time, well,

00:30:41

linearly

00:30:43

linearly over time, let's

00:30:45

write a small one

00:30:50

in this case, we can use

00:30:53

another formula ds induction is equal to minus

00:30:56

delta f by delta t we

00:31:01

will also use this quite often, this is often

00:31:04

found on the Unified State Exam, well, naturally, in

00:31:06

reality we will consider just the module without

00:31:10

any signs,

00:31:12

just delta f for a while about the direction

00:31:15

ds induction is determined by Lenz’s rule

00:31:17

again

00:31:20

yes this was the derivative guys,

00:31:35

it’s called Frodi’s law, if it

00:31:38

changes uniformly but at the same

00:31:40

time it changes by the same amount, then like

00:31:42

this, if it’s not

00:31:45

uniform according to the harmonic law,

00:31:47

let’s say it’s okay, we just change

00:31:50

the dependencies,

00:31:52

which would be small, but it’s just that I

00:31:55

showed that the linear dependence from

00:31:57

time,

00:31:59

well, if uniformly, you can also

00:32:02

use derivatives, as it were, look

00:32:04

here we get

00:32:06

deltas on on delta t, let’s say

00:32:09

time t passed us was 0 and

00:32:15

became

00:32:17

there

00:32:20

b&b on with cosines let them be units and divide

00:32:25

it all by time in this case bs I

00:32:28

get it and

00:32:30

if I just took the derivative, that

00:32:34

is, I have a magnetic flux

00:32:37

bts, then the derivative from this, you can

00:32:42

read in modulus, would also be bs, that is,

00:32:46

derivatives can always be used, but

00:32:48

delta as much as delta t can be

00:32:50

used only when yours

00:32:51

changes uniformly,

00:32:55

why doesn’t omega in a square, why the hell should he

00:32:58

be squared and once he took the

00:33:00

derivative just

00:33:08

to tennis,

00:33:10

you see how the BTS magnetic flux penetrated

00:33:15

even

00:33:18

all this I erase Farad's law we

00:33:21

discussed

00:33:43

from the window I will open

00:33:50

not Faraday's law that is just a numerical

00:33:54

value to find and that's when you have

00:33:56

this induction current arises in some

00:33:58

closed circuit, this circuit

00:34:01

necessarily has some kind of resistance

00:34:02

r and this ds induction is equal to the

00:34:07

product of the induction current and the

00:34:11

resistance of the

00:34:15

creature and why did I

00:34:18

once throw one of the

00:34:21

port teachers out of my position

00:34:22

because this [ __ ] just like that,

00:34:25

he outlined in a frame that the current strength is approximately

00:34:28

equal to the induction emf, and this is measured

00:34:31

in volts, this is measured in amperes, it did

00:34:35

n’t bother him, just in

00:34:36

case, let’s cross it out so that you

00:34:40

write notes like this, in general, this [ __ ] at an

00:34:44

open webinar, this is what I overwritten

00:34:46

the student about this created an open post and

00:34:49

he was quickly fired,

00:34:52

and that is the area and

00:34:56

this is me washing the

00:35:06

shower, not the

00:35:13

magnetic flux,

00:35:16

it does not arise due to magnetic induction,

00:35:20

this in itself is magnets, the

00:35:23

flux is the product of

00:35:25

magnetic induction by the area of the circuit by the

00:35:29

cosine of the angle between them everything is

00:35:33

just the presence of a magnetic field it

00:35:35

creates

00:35:41

a drink I’ll take

00:35:44

that the voice sat

00:35:56

well

00:35:59

so

00:36:01

[music] there are

00:36:11

a lot of theories left until the theory one more for

00:36:14

[ __ ] the

00:36:19

change in the magnetic field of the house generates the

00:36:23

induction emf

00:36:27

now let’s discuss the coil with

00:36:32

icons we will draw it this is the

00:36:35

fat part of the coil

00:36:49

it means that the coil has inductance just like a capacitor,

00:36:58

oh capacitors have electrical capacitance, the

00:37:01

coil has inductance, that is, it is the

00:37:05

same value that depends purely

00:37:09

on the

00:37:10

geometric

00:37:11

parameters of our coil, it depends on the

00:37:14

number of turns from the conductors

00:37:17

on the area, that is, there is a purely geometric

00:37:22

formula there, but fortunately this

00:37:25

there is no formula in the codifier and you

00:37:28

actually don’t need to know it,

00:37:30

but it is important to understand that the inductance of the

00:37:35

coil will be greater the greater

00:37:37

the number of turns,

00:37:38

this is important to know, there are no formulas, I even

00:37:41

forgot now, I

00:37:45

’ll write it down, but you don’t need to know it, that

00:37:52

is, don’t go

00:37:57

here this is the formula for the inductance of

00:38:00

the coil

00:38:01

this is the magnetic permeability of the medium and tanya

00:38:06

zero magnetic constant n square the

00:38:10

number of turns with

00:38:12

area length

00:38:14

is not in the codifier and you don’t need to know you do

00:38:17

n’t need to know

00:38:19

either

00:38:22

and

00:38:23

this value

00:38:26

shows

00:38:29

how the magnetic flux and the strength of the current

00:38:33

flowing in the culture are related

00:38:36

there is essentially a coefficient of

00:38:38

proportionality between the magnetic

00:38:40

flux and the current strength, well, just like there the

00:38:44

charge

00:38:46

q is equal to c on the street, draw this analogy with

00:38:50

each other, that is, like

00:38:53

here this color coefficient of

00:38:55

proportionality between the charge and the

00:38:56

voltage on the capacitor is exactly the same as the

00:39:01

magnetic flux

00:39:04

which it is created by this current

00:39:07

sense, we have a current when it flows through a

00:39:10

conductor, let’s imagine that it

00:39:11

tick tock like this when it flows through a

00:39:14

conductor, it creates magnetic induction

00:39:18

and this is the

00:39:19

magnetic induction and the

00:39:25

coefficient of proportionality between

00:39:27

this

00:39:30

magnetic induction per area per

00:39:32

cosine of the angle between them this is the

00:39:34

magnetic flux and current strength, this is the

00:39:36

inductance of the coil and

00:39:39

if

00:39:43

what is it guys, sorry up and the

00:39:47

rule

00:39:49

was used incorrectly and

00:39:51

if you and I change the

00:39:57

current strength, what will happen is the

00:40:01

magnetic flux will change and a change in the

00:40:04

magnetic flux will lead

00:40:07

to ds the most inductions and

00:40:10

self-inductions,

00:40:12

also according to Farad's law, this is minus f

00:40:15

prime from t,

00:40:17

that is, it turns out minus el and prime from

00:40:22

t these are individual

00:40:25

self-inductions,

00:40:30

it occurs when your coils

00:40:33

change the current strength, but if for a

00:40:38

uniform case, for a uniform

00:40:46

emf, the self-induction would be equal to minus n

00:40:49

delta

00:40:50

divide by delta t and

00:40:54

this is for anyone for anyone

00:41:00

by the way I forgot to say what the

00:41:02

inductance of the coil is measured in, it is measured in

00:41:05

Henry

00:41:21

so everyone understands the

00:41:32

excellent student then let's move on

00:41:35

13 photos of

00:42:07

Schweppes swallowed it

00:42:18

turns out if we have one turn

00:42:23

then the inductive emf that arises in it

00:42:27

will be equal to the

00:42:29

change magnetic flux for a while, well,

00:42:33

let’s say we have a plan to give unevenly

00:42:35

minus f prime from t yes, but if we have

00:42:39

turns connected in parallel, but that is,

00:42:43

again, I mean a coil like this,

00:42:45

they are connected and we have one

00:42:49

two three 4 5 5 turns there then the total ds of induction

00:42:54

let’s generally

00:42:56

be equal to the number of turns per

00:43:00

induction emf of one turn,

00:43:02

similarly, the more turns the

00:43:06

more current you have, so when

00:43:09

you just take a circuit and like that

00:43:12

the magnet doesn’t rest, you don’t feel a damn thing

00:43:14

when you have a coil where

00:43:15

the minimum a million and flowers you have there even

00:43:18

starts to fluctuate and happen

00:43:19

because, well, the more you turn it up, the

00:43:23

more current you have, by the way, a Tesla

00:43:26

coil works on the same principle

00:43:28

and how can it be used somehow?

00:43:34

We can create a transformer.

00:43:40

The transformer changes the voltage on the

00:43:43

input circuit to on the weekend, that is,

00:43:45

here you and I have

00:43:49

3 turns, let’s say up to

00:43:53

3 turns and the voltage there is one of some kind,

00:44:04

since we have a flow here,

00:44:08

as we will have a flow, let’s let the current flow in this

00:44:11

direction,

00:44:13

let the current flow here and it

00:44:17

creates a magnetic induction vector

00:44:19

which spreads like this along the core,

00:44:21

but what is the peculiarity

00:44:25

of the core,

00:44:27

it twists the magnetic induction vector

00:44:31

and forces it to move here,

00:44:34

that is, the magnetic induction vector does not

00:44:36

leave it but passes purely inside

00:44:39

it,

00:44:41

so it

00:44:54

turns out that

00:45:01

if we wind more of these

00:45:05

turns of the coil here

00:45:16

there will be n1 turns here, n 2 turns, then

00:45:20

we will get more voltage

00:45:23

because the magnetic induction through these

00:45:26

cores is the same, but

00:45:31

the voltage will induce and different

00:45:34

because with an increase in turns, the

00:45:37

magnetic flux increases, so the

00:45:40

changes in the magnetic flux in one we

00:45:43

multiply by the number turns the

00:45:47

voltage on the first

00:45:50

is related to the voltage on the second in the same way

00:45:53

as the number of turns on the

00:45:54

first is related to the number of turns on the second the

00:45:58

more turns the more

00:46:00

common and ds

00:46:03

everyone understands guys and

00:46:11

so we can

00:46:13

convey

00:46:15

yes this

00:46:18

electrical box is what

00:46:22

the night in a row next to is called with every

00:46:24

house there is a

00:46:26

building

00:46:28

where there is such a transformer and

00:46:32

high-voltage voltage is transmitted through the wires

00:46:34

in order to minimize the

00:46:36

loss of

00:46:38

lost energy, that is, there is a full

00:46:41

3000 volts or something like that and then,

00:46:44

due to a step-down transistor, we

00:46:46

bring it to

00:46:48

220 volts

00:46:51

there’s a transformer booth, and here’s a

00:46:54

banner of ender [ __ ] in the

00:46:56

transformer booths, this thing is

00:46:57

there, so if you get hit by 220

00:47:01

volts, you won’t die, but it’s unpleasant,

00:47:03

of course, you can die, but you can survive

00:47:06

me, in any case, 4 times, for sure, Bella

00:47:08

220 volts, and

00:47:11

if you hit me, 3000 volts hit me I

00:47:14

probably wouldn’t have survived, or I would have been

00:47:16

disabled for life,

00:47:25

the source went along the first circuit,

00:47:28

created Victor Betty, went through

00:47:30

the core and created a

00:47:32

number of turns on a coil, while creating a

00:47:34

voltage u 2 yes yes, that is, you have

00:47:40

this magnetic one here the

00:47:43

induction of this field changes

00:47:46

over time, it’s all like we talk

00:47:48

about alternating current, here it

00:47:50

changes, here the magnetic flux has changed, and

00:47:52

here the magnetic flux has changed, and this

00:47:58

creates changes in this magnetic flux if there were one turn here and here

00:48:01

m tons n times created more voltage

00:48:03

before would create at the output, that is,

00:48:06

I drew a step-up transistor on

00:48:09

your sidewalk in front of the step-up

00:48:11

transformer, sorry,

00:48:22

the formula is integral, you need to

00:48:29

[music]

00:48:40

tags we do

00:48:47

n’t know at all, in fact, guys, this is

00:48:49

purely in theory, so I don’t do this,

00:48:53

we’re just people when

00:48:57

everyone left,

00:48:59

so what else do we need to do? Yes, in

00:49:07

general, it will hit the voltage; it’s

00:49:13

the strength of the current that passes through

00:49:15

the person that is important; it was a success;

00:49:22

no, it’s all

00:49:25

quite stupid; I had a renovation

00:49:28

at the dacha; I just go in and turn on the light and

00:49:32

you understand that there are no switches like

00:49:34

that, two wires in your hands, and

00:49:36

you know, someone was bitten by a wasp 220 volts, well, it

00:49:40

beats something like this

00:49:43

[music]

00:49:46

by the way, alternating current is more dangerous than

00:49:48

constant current, let's now discuss

00:49:50

exactly

00:49:53

how alternating current appeared,

00:49:58

let's draw such an oscillatory circuit,

00:50:07

that means

00:50:10

we have an inductance coil l here

00:50:14

we have a capacitor capacitance electrical capacity

00:50:17

yutsa

00:50:19

there is such a formula Thompson's formula for the

00:50:25

period of oscillation of a

00:50:29

closed circuit

00:50:31

formula

00:50:36

Tong sleepy

00:50:41

yours no

00:50:43

many for some reason write Thompson she is

00:50:47

punished for this in the Unified State Examination and

00:50:54

how the oscillation goes in our country,

00:50:55

look let's say we

00:51:01

charge the capacitor first what happens

00:51:05

next

00:51:09

the capacitor tries to discharge, well,

00:51:12

because it is discharging,

00:51:15

current begins to flow here and when the capacitor has

00:51:18

zero charge, the current strength through the coil

00:51:21

will be as far as

00:51:24

possible what happens

00:51:33

here the charge comes, the capacitor

00:51:37

is recharged, well,

00:51:39

with other signs, change the

00:51:42

charges, that is, now on the right + the left

00:51:45

minus now further on

00:51:49

he again feels that something is not

00:51:52

right and begins to flow in the other

00:51:55

direction, it

00:51:57

flows here

00:51:59

when the current strength here is maximum,

00:52:04

here behind the capacitor is discharged and then

00:52:09

we return to the beginning, that is,

00:52:12

here, that

00:52:13

is, here a quarter of the period

00:52:15

passes here a quarter of the period

00:52:18

passes here, a quarter of the period passes, and

00:52:20

in general they returned to the beginning, a

00:52:24

quarter of the period still passes, that is, four quarters,

00:52:27

so the period, in fact, the

00:52:29

period of oscillations has passed, that is, the charge ran

00:52:32

here, ran back, and here we have

00:52:37

the oscillatory circuit

00:52:39

oscillating 11 times and thus we have an

00:52:42

electromagnetic wave is created

00:52:44

due to such oscillatory

00:52:46

circuits and the

00:52:49

radio transmission works, we can

00:52:52

set some frequency with which

00:52:55

this circuit will oscillate,

00:52:57

which means here the elf is the capacitance of the condensate of the

00:53:00

capacitor, the goal

00:53:02

is the inductance

00:53:05

with this capacitance of the capacitor el

00:53:08

inductance of the coil and it

00:53:10

turns out if we energy

00:53:13

was not lost now, tell the tractor without

00:53:16

taking into account the

00:53:19

energy of the coil, which by the way

00:53:21

is calculated by the formula

00:53:23

n-not squared in half,

00:53:26

the energy of the coil plus the energy of the

00:53:28

capacitor

00:53:30

would remain a constant value,

00:53:33

that is, when we have the maximum charge

00:53:37

on the capacitor,

00:53:40

we have all the energy on the capacitor when

00:53:43

we have the maximum current through the coil

00:53:47

we have all the energy on the coil, and at

00:53:50

some arbitrary moment in time

00:53:52

we will simply have their sum

00:53:57

equal to these two quantities

00:54:00

more what is an oscillatory circuit

00:54:05

circles is a zero charge

00:54:27

why on the tabs the charges will change

00:54:29

places but they are by inertia you understand they

00:54:33

they cannot immediately

00:54:34

run from here to here in one second, they accelerate there

00:54:37

as they are doing something here, first a

00:54:41

self-induction emf arises here,

00:54:43

which prevents this change,

00:54:46

then the dsn self-induction gradually

00:54:48

weakens and becomes villages only at its

00:54:52

maximum, then the

00:54:55

current

00:54:56

reaches its peak and begins

00:55:01

to weaken and arises emf of self-induction

00:55:03

which strengthens it at night tries to make

00:55:06

efforts but in general it

00:55:09

happens by inertia

00:55:15

imagine that this is potential energy

00:55:17

kinetic here you are first

00:55:20

potential maximum then in

00:55:23

this position the ball deviates to here

00:55:25

to here walks here you have potential 0

00:55:28

and genetic maximum and then

00:55:31

the ball but they don’t stop, it

00:55:33

moves upward by inertia and your

00:55:36

political energy again becomes 0

00:55:39

and the potential maximum, that is, this is

00:55:41

the analogue of this energy, this is the kinetic

00:55:45

energy, the analogue of this is the potential

00:55:49

energy of the capacitor

00:56:07

tags

00:56:24

what else, what else can I tell you,

00:56:28

by the way, the harmonic law also holds here

00:56:29

oscillations, the charge

00:56:37

can be expressed there either in terms of sine or

00:56:40

cosine, this is q 0 this is the maximum

00:56:43

charge that is here plus q 0 minus

00:56:46

q zero

00:56:47

then

00:56:49

if we take the derivative

00:56:51

then we get the current strength,

00:56:54

that is, this is q 0 per omega per cosine

00:57:00

omega t well it turns out the same on the other

00:57:05

side and 0 and cosine omega you that is, and the

00:57:08

maximum

00:57:10

is the maximum charge multiplied by the

00:57:14

cyclic frequency 20 lic frequency

00:57:17

the same as always it is 2 pi by t that is

00:57:22

two pi by 2pi root of lc

00:57:26

that is one to the root of c,

00:57:30

all this also works here as for

00:57:33

all harmonic oscillations,

00:57:42

such things, brothers,

00:57:47

what else can I say

00:57:51

about the period I said and

00:57:55

let’s build graphs, it

00:58:03

turns out to be a graph of charge versus time, but in

00:58:07

this case I just have a sinusoidal

00:58:11

graph of current strength versus time.

00:58:16

The cosine wave comes out, and if I were to draw the energy,

00:58:19

then I would have the energy of the

00:58:22

capacitor would

00:58:23

be like this,

00:58:26

remember the bras called it, and

00:58:29

the energy of the coil

00:58:34

would be like this,

00:58:40

ah, the same thing with sorry, the energy of the

00:58:44

coil, what is

00:58:48

wrong here between the initial charge

00:58:51

0 to the energy of the capacitor began

00:58:54

to begin it would start from zero and

00:58:56

gradually increase, and

00:58:59

this is what we would get, and the

00:59:02

energy of the coil is

00:59:08

initially maximum and

00:59:12

changes like this, and it depends on the

00:59:15

initial data, in fact, if

00:59:18

we initially had no current strength,

00:59:21

the capacitor was charged, as in this

00:59:24

case then we would have the opposite q would be

00:59:27

while the sine wave and along the sine wave

00:59:34

things would go like this yes

00:59:48

guys here here I have for for

00:59:51

for this case if the

00:59:53

capacitor is initially charged I have here

00:59:56

cosine omega you a and minus q 0 omega

01:00:02

sine omega you are here I have a different form

01:00:07

below, I just showed it for another case

01:00:10

if initially the current flowed through the coil

01:00:22

so well, okay, everything seems to be more or less

01:00:25

explained,

01:00:27

let’s solve the problems and then if there’s anything

01:00:29

else I’ll explain before, so

01:01:17

now I’ll cover it,

01:01:46

and

01:01:48

by the way, you know what let’s do more I will show

01:01:53

you a codifier on these on these on this

01:01:56

topic so that you understand what

01:01:58

a codifier is and what is not

01:02:15

c

01:02:29

look here is our formula for

01:02:31

electromagnetic induction the

01:02:33

vector flux is naturally and here

01:02:36

formula b is perpendicular and if

01:02:39

formula b c to cosine alpha you can

01:02:41

use the

01:02:42

phenomenon of electromagnetic induction

01:02:47

manifestation so the law of electromagnetic

01:02:49

induction here is Faraday's law you

01:02:52

see it is written this way and that way it is

01:02:55

simply through

01:02:57

essentially for the case of a uniform

01:03:00

change in the magnetic flux this for the

01:03:02

general case

01:03:04

and

01:03:07

ds induction over we talked to you about

01:03:10

this formula

01:03:14

Lenz's rule here is inductance you see

01:03:17

here there is this the formula and a long time obvious or

01:03:20

aphron and well, in general, it doesn’t matter, so it’s

01:03:22

possible that

01:03:23

self-induction is also the energy of the

01:03:27

magnetic field of the coil, but in fact everything

01:03:29

is everything that is necessary

01:03:47

guys from the wound for the thief’s font blunted then

01:03:50

and what doesn’t make me sick 2 normal

01:04:07

lines of induction of a uniform magnetic

01:04:11

field pierce a frame with an area of \u200b\u200b0 5

01:04:15

meters in a square at an angle of 30 degrees

01:04:19

to its surface,

01:04:21

pay attention to how these bastards

01:04:25

tried to deceive us, that is, here are the lines of

01:04:28

magnetic induction, here is

01:04:29

the normal, but we were not given an angle with

01:04:32

the normal,

01:04:33

we were given an angle with its surface, the bastards

01:04:38

gave us this angle

01:04:41

pay attention and the angle that we

01:04:44

usually use is

01:04:46

90 minus alpha the angle between the normal and the

01:04:49

magnetic induction vector

01:04:52

creating a magnetic flux equal to 0 2

01:04:56

weber

01:04:58

what is the magnitude of the

01:05:00

magnetic field induction vector, but it is clear that f

01:05:04

would be equal to c times the cosine of 90 minus alpha bastards and

01:05:09

then the

01:05:10

magnetic induction

01:05:13

fsb already by sine alt because according to the

01:05:16

reduction formula there it changes to sine

01:05:18

and then we get 0 2 divided by 0 5

01:05:22

by sine 30

01:05:26

that is, four times we increase,

01:05:29

which means 08 tesla

01:05:58

I erase

01:06:00

along smooth horizontal conducting

01:06:03

rails is located in a

01:06:05

homogeneous vertically in the magnetic the field

01:06:07

is moving straight copper jumper look at the

01:06:11

picture top view the ends of the rails are

01:06:12

connected by wires determine how it is

01:06:14

directed inside the contour formed by the

01:06:16

rails by the wire and the jumper the

01:06:20

induction vector of the magnetic field created by the

01:06:22

induced current,

01:06:25

that is, look what a miracle is happening here,

01:06:29

this kind of [ __ ] is

01:06:32

vector induction,

01:06:35

probably Oleg, who is

01:06:37

supposed to be looking for this and so I drew it with a

01:06:40

big nipple, so we have a

01:06:43

closed circuit and the conductor is moving here,

01:06:47

here it is moving at some speed,

01:06:49

that is, the magnetic flux, what

01:06:53

happens to it bns on the cosine alpha,

01:06:56

we have this, the area of this

01:06:59

circuit, it becomes smaller,

01:07:06

it becomes smaller, yes, you can

01:07:09

take the cosine of 60,

01:07:11

then it turns out that the

01:07:14

magnetic flux weakens and well, in

01:07:16

space, in general, let’s remove the unit for crap,

01:07:19

just

01:07:20

understand, yes, that

01:07:23

means an induction emf arises

01:07:25

that tries to strengthen it, it will

01:07:29

help,

01:07:30

he wants to increase it, that is, it will

01:07:33

twist in this direction

01:07:37

that is, it twists here and

01:07:40

creates an

01:07:42

induction current that is also directed at us

01:07:47

[applause]

01:07:48

and

01:07:49

this magnetic induction created by the

01:07:53

induction current will also look at us

01:07:55

because our area

01:07:56

is decreasing, it will try to

01:07:59

increase it by the way, remember, we

01:08:02

derived this formula then that the VAT of

01:08:05

induction is equal to in was

01:08:09

let's now derive this using the

01:08:11

flow formula, that is, look,

01:08:15

let's say in time, well, let you move

01:08:18

uniformly and in time t it moved

01:08:22

here instantly t length here el of

01:08:26

this conductor or

01:08:29

it turns out without induction well modulo

01:08:34

naturally Let's write down everything delta p

01:08:37

by t for the time that has passed, what

01:08:43

changes here we would not change here

01:08:45

by area changes by value delta s

01:08:50

adel t.s. the change in area is equal to b by

01:08:57

let's write modulo and the area

01:09:00

has changed by this value by l

01:09:05

multiplied by v by t and divide all this by t

01:09:09

and from here it turns out that the

01:09:12

induced emf is equal to in was that is, and in

01:09:16

the direction we can determine according to the

01:09:17

Lenz rule and its value can be found

01:09:22

using this formula, which again is in

01:09:24

the codifier and usually this formula is of course

01:09:27

in through the flow, but since we then don’t

01:09:29

know what it is yet, I introduced it

01:09:32

using the Lorentz force,

01:09:39

so

01:09:53

in the last problem the answer was

01:10:14

you can look at us once again with the help of London by

01:10:16

reconsidering just what is not it once again

01:10:18

display

01:10:20

mainly through the memorable flow

01:10:35

saved and today is Easter the

01:10:39

figure shows a graph of the dependence of the

01:10:41

magnetic flux penetrating the circuit

01:10:44

on time at which section in the circuit the

01:10:46

maximum modulo ds

01:10:48

induction occurs, please note what

01:10:50

is changing here and d the magnetic flux is uniform,

01:10:54

so at each interval we can

01:10:57

find simply as delta f by delta t

01:11:03

let's see where he apologized most steeply

01:11:05

for the same time, well, it

01:11:08

is obvious that this is the second section, the

01:11:11

largest angle of inclination will be in the

01:11:14

second section

01:11:16

the maximum according to modules ds will be on the

01:11:19

second section of

01:11:33

cisco fifa

01:11:35

today is not Easter damn well,

01:11:43

I’ve already painted my eggs

01:11:50

all this I’m washing the

01:11:55

picture

01:11:57

shows a graph of current strength versus

01:12:01

time in an electrical circuit

01:12:03

whose inductance is 1 mile henry

01:12:07

10 minus 3 henry we’ll convert everything at once

01:12:12

determine module 2 most inductions in the

01:12:15

time interval from 15 to 20 seconds,

01:12:17

again we see that here the

01:12:20

night of BDSM and inductions

01:12:23

el delta and on delta t are changing uniformly everywhere and we are

01:12:28

asked for a

01:12:30

modulus and we will find,

01:12:33

well, just 10 in minus 3 means from 15 to

01:12:38

20 y us, the current strength decreases by 20

01:12:42

milliamps 20 milliamps and the time

01:12:46

passes five seconds, it’s clear and do 15

01:12:49

20 5 seconds, that is, we get 4

01:12:53

microvolts and

01:13:06

Sanya had to order the web, but what to do with

01:13:08

such a life, only drink Schweppes

01:13:11

in the morning, the

01:13:46

figure shows a graph of the dependence of the

01:13:48

magnetic induction model fields from

01:13:51

time t in this field perpendicular to

01:13:54

the lines of magnetic induction is placed a

01:13:55

conducting rectangular counter

01:13:57

resistance of 0 25 m 0 25 m

01:14:03

length of the rectangle 5 centimeters

01:14:06

width 400 two centimeters

01:14:09

that I can’t think of the area to calculate

01:14:12

so why are you giving me the length and width

01:14:16

disrespect what I am condition of the problem,

01:14:19

find the value of the induced current

01:14:22

flowing along this circuit in the

01:14:24

time interval from 5 to 9 seconds,

01:14:28

we see that the magnetic induction vector

01:14:32

changes by the value 05 this love during this

01:14:37

time, the graph shows that it was 05 became

01:14:39

0 after 4 seconds,

01:14:46

which means the induction emf is not equal to the

01:14:50

magnitude of the current equal to delta p by 1

01:14:54

divided by the so-called. we modulo everything

01:14:58

here as usual and it is equal to 0 5 by

01:15:02

10 by 10 minus 4 divided by the time up to 4

01:15:10

so well 125 by 10 minus 4 volts

01:15:21

so then we need to find the current strength

01:15:25

now and

01:15:26

divide this by r that is 125 by 10 minus

01:15:31

4 divided by the resistance 0 25

01:15:36

5 4 multiplied by 45

01:15:41

I hope minus 4 amperes asks us in

01:15:44

milliamps

01:15:46

05 milliamps

01:15:54

so and

01:16:28

so it’s very important I have a very bad attitude towards

01:16:32

this whole conflict in general

01:16:35

I don’t like everything and it’s just

01:16:38

dragged on as [ __ ] up

01:16:42

as possible the war is treated

01:16:44

disgustingly, people die and here and there

01:16:48

everyone feels sorry for them

01:16:56

when conducting experiments to study

01:16:59

electromagnetic induction, measure the

01:17:01

change to measure the change in the

01:17:04

magnetic flux penetrating a

01:17:06

closed wire circuit and the charge

01:17:08

delta q flowing as a result of this

01:17:12

along the circuit, below is a table

01:17:14

obtained as a result of

01:17:17

these experiments what equal to the

01:17:18

circuit resistance I,

01:17:21

which is a residential module, is glossy and it’s

01:17:24

generally tinny, I have some students

01:17:26

right here in these cities where these

01:17:30

military operations are taking place, they’re actually

01:17:32

shooting right there, I’m just in shock and I don’t

01:17:34

know them there during the day, maybe they’re shooting

01:17:37

at anyone there - sometimes someone gets

01:17:39

killed and

01:17:40

I don’t know, it seems to me that this is

01:17:42

some kind of savagery and

01:17:44

these are

01:17:46

politicians playing their games, people are suffering

01:17:51

sadly, it’s all very true and ds of induction is

01:17:55

equal to the current strength multiplied by

01:17:58

the resistance and the current strength can be

01:18:01

written as

01:18:03

[ music]

01:18:05

divided by delta t, well, if we untwist this

01:18:08

ball,

01:18:10

then we get q by

01:18:14

delta t

01:18:15

multiplied by r

01:18:18

delta ef divided by delta t and

01:18:22

note that the time

01:18:25

is reduced and

01:18:28

then we can find the resistance of

01:18:30

the circuit, it is times equal to the change in flow,

01:18:34

let's do it here We will also write deltas for the sake of

01:18:36

decency for changes in charge, well, the charge

01:18:39

that has leaked and we get

01:18:41

changes in the flux, we have 001

01:18:46

here 5 per 10 -30 coulomb, that is, it comes out to 2

01:18:52

ohms, this is the resistance they

01:19:11

also give there, and in the same place

01:19:14

these are in the LPR in the DPR there In my opinion, they

01:19:19

pass a toy or they have some kind of

01:19:21

exam of their own, but they can apply to us

01:19:23

in general, or maybe they know

01:19:26

what they may live there but enroll in

01:19:30

Russia because from the LPR and DPR, in my opinion,

01:19:33

Russian universities are allowed there

01:19:35

without hindrance. I don’t know for sure, but in

01:19:38

general I have students from there, in

01:19:40

any case there were, I don’t know now, maybe

01:19:41

someone is sitting in your linen

01:19:48

20 meters away,

01:19:57

so now, well, everything is correct, sir,

01:20:27

what energy is stored in the

01:20:29

inductor if it is known that a

01:20:31

current of 0 5 amperes flows through it the

01:20:36

flux of the piercing turns and windings

01:20:39

is equal to

01:20:41

6 weber

01:20:45

what energy is stored in the coil

01:20:49

in general we have such a formula but we

01:20:53

don’t have

01:20:54

inductance what to do is very

01:20:56

simple we will express from this formula the

01:20:59

inductance is ef divided by and and

01:21:03

then when substituting we get

01:21:07

ef divide by y multiply by and square in

01:21:09

half and

01:21:11

cancel and get fairies in half

01:21:17

but also in half is 605 divided by 2 that is

01:21:22

three by one and a half let's immediately one and a

01:21:26

half joules

01:21:32

6 bieber

01:21:46

all this I erase

01:22:11

what energy is stored in the coil with

01:22:14

inductance 01 henry

01:22:18

if the flux is piercing the turns winding

01:22:21

is equal to

01:22:23

0 6 Weber and

01:22:28

well, here it looks like we

01:22:31

don’t have any situations and it

01:22:33

turns out f divided by l well, when

01:22:37

substituting

01:22:40

the energy of the coil l and the square in half,

01:22:45

again we leave el in half on here

01:22:48

we have a square by el square and

01:22:52

we get f square divide by 2 liters,

01:22:56

pay attention to how

01:22:58

similar this formula is to this square divide by

01:23:00

20,

01:23:02

we get the energy of the coil

01:23:06

0 6 squared divide by 2 by 0 1

01:23:11

what in the bastard is

01:23:17

6 squared

01:23:22

18

01:23:28

here

01:24:02

in the experiment on observing electromagnetic

01:24:05

induction, a square frame made of one

01:24:07

turn of a thin wire is in a

01:24:09

uniform magnetic field

01:24:11

perpendicular to the plane of the frame, the

01:24:13

induction of the magnetic field uniformly

01:24:15

increases from zero to the maximum

01:24:17

value would be maximum and during time t, an

01:24:21

induction emf

01:24:23

equal to 6 millivolts is excited into the frame, let's ds induction

01:24:26

16 millivolts

01:24:29

what is the ds induction appears in the framework if

01:24:33

time is reduced by 3 times a b

01:24:36

maximum is

01:24:40

reduced by two times you look at ds

01:24:43

induction what is

01:24:46

delta b on c on t

01:24:52

in this case you have decreased by 3

01:24:54

times

01:24:56

delta b is essentially equal to b

01:25:00

maximum

01:25:02

maximum

01:25:04

minus 0 because the initial magnetic

01:25:08

induction was equal to zero,

01:25:10

well, it turns out that here we can simply

01:25:14

put the maximum b the maximum

01:25:17

decreased by 3

01:25:18

this climb to 2

01:25:21

this decreased by 3 well, that is, it was like this and it

01:25:26

became like this b the maximum divided by 2

01:25:32

multiplied by c divided by t

01:25:35

divide by 3, that is, three second

01:25:40

b of the maximum

01:25:43

on s to t, that is, three second from what

01:25:48

was without induction 1, that is, without induction,

01:25:52

two three second from 6, that is, 9 millivolts,

01:26:17

I will be three second, is it you for fun or

01:26:21

seriously,

01:26:29

let's move on

01:26:32

[ music]

01:26:55

I am washing a

01:27:25

constant electric current of

01:27:27

2 amperes flows through a wire coil, while the flux of the

01:27:31

magnetic induction vector

01:27:33

through the circuit limited by the turns of

01:27:35

the potato is equal to 4 miles Weber

01:27:43

to the flow vector 4 miles Weber

01:27:47

electric current of what strength must

01:27:50

flow across the coils in order for the flux of the

01:27:52

magnetic induction vector crock for the

01:27:54

indicated counter was equal to 6 miles and weber

01:27:57

but look here f1

01:28:02

26 miles and weber

01:28:05

we have inductance,

01:28:08

well, let's do this f equals l on both

01:28:15

f1 and f2

01:28:17

as well as 102 for the same

01:28:20

coil if the target does not change,

01:28:23

that is, barely this and one by f2

01:28:28

divided by f1,

01:28:35

well, everything is correct equals

01:28:40

26 by 4, despite the fact that in both cases it is

01:28:44

not necessary to convert Vader miles

01:28:46

because they are reduced,

01:28:50

it turns out

01:28:53

3 amperes, here

01:29:13

Sanya February 23, what are you doing

01:29:15

[music]

01:29:16

why don’t I note here I didn’t serve, he’s not

01:29:20

a man,

01:29:22

he’s my brother, he served him, I’ll congratulate the

01:29:37

students of the ports, I need to congratulate my

01:29:51

brother, he served

01:29:54

in a

01:29:57

damn place in Moscow, I served somewhere, I do

01:30:00

n’t remember exactly the address

01:30:07

when Thomson’s formula will be there, it was already

01:30:10

like this, between the problems of

01:30:20

you, what kind of heart defect a coherently

01:30:25

wire frame with an area of 2 by 10 minus

01:30:28

3

01:30:32

square meters

01:30:34

rotates in a uniform magnetic field

01:30:36

around an axis perpendicular to the

01:30:38

magnetic induction vector, the magnetic flux

01:30:40

penetrating the area of the frame changes

01:30:42

according to the law, you see here the law we

01:30:44

have f is equal to 4 by 10 minus 6 cosine 10

01:30:51

peak to you

01:30:53

where all quantities are expressed, everything is equal to the

01:30:56

magnetic induction module, the answer is expressed

01:31:00

in mile numbers,

01:31:04

it’s cool, well, it’s not clear,

01:31:09

well, that would be hitting the omega cosine,

01:31:13

etc.

01:31:15

Well, then everything even becomes clear, that

01:31:17

is, this is

01:31:20

ps4 by 10 minus 6,

01:31:23

that is,

01:31:25

b4 by 10 minus 6 divided by s2 by 10 -3

01:31:30

kit

01:31:32

2 Tesla miles, there in the world she asks, and

01:31:41

by the way, we have a period

01:31:45

they asked 2pi divide by t this is

01:31:49

omega and from another country by 10 and

01:31:53

that means the period would be equal to 1 5 that is 0

01:31:58

2 seconds

01:32:20

he is also naughty physics take physics

01:32:25

he doesn’t fumble he didn’t take it he took

01:32:28

computer science and

01:32:32

he did okay there geodesy

01:32:35

cartography this is the norm of us do

01:32:37

surveyors, the most suitable,

01:32:40

but he did not study my brother,

01:32:46

in a raised

01:32:51

uniform magnetic field with induction

01:32:54

forty miles and tesla 40 or tesla

01:33:00

there is a flat contour in the form of a ring with a

01:33:02

radius of 5 centimeters 5 centimeters and

01:33:07

I will not translate everything

01:33:09

first, the counter is located so that the

01:33:12

lines induction of the magnetic field

01:33:13

perpendicular to the plane of the ring, that

01:33:16

is, at first everything was fine, it was

01:33:19

perpendicular,

01:33:23

then the ring is turned around its

01:33:25

diameter by

01:33:27

120 degrees,

01:33:30

that is, look at how to turn it by

01:33:33

120 degrees,

01:33:35

let’s do this like this, this is how I turned it, then I

01:33:41

turned this position by 90 and

01:33:45

then even further,

01:33:55

that is, well, you know, yes, this

01:33:57

is spinning like this, that is, it

01:33:59

was

01:34:09

in

01:34:13

what I was doing, what you did in this, that

01:34:19

is, from this position, before it

01:34:22

was like this, 120 degrees passed,

01:34:24

you know

01:34:26

or don’t understand, the

01:34:31

normal was looking here first the

01:34:38

closed loop lay like this, then we

01:34:42

turned it like this and another 30,

01:34:46

at first it looked normally here,

01:34:49

then here it is,

01:34:56

so find the modulus of change in the flux of the

01:35:00

magnetic induction vector through the ring

01:35:03

with such a turn,

01:35:07

so delta f

01:35:11

modulus of changes

01:35:15

in the rf of course and

01:35:19

minuses

01:35:21

focus

01:35:23

f of course this is b

01:35:26

on c

01:35:30

means there was a cosine of

01:35:34

90 degrees,

01:35:37

explain the cosine of zero degrees was well, the

01:35:40

angle between the normal vector of magnetic

01:35:43

induction was zero degrees, this angle is 0

01:35:46

degrees and

01:35:48

[music]

01:35:49

became 120 degrees larger and

01:35:53

in the beginning it was b on c to cosine 0 well, that

01:35:58

is, one

01:35:59

well here and all that

01:36:01

remains is just to substitute it

01:36:04

means b.s.

01:36:07

cosine of one hundred and twenty -1

01:36:13

cosine of one hundred and twenty

01:36:17

sine 30 1 2

01:36:21

well, it’s clear why

01:36:28

areas

01:36:29

on minus one second turns out to be something 1

01:36:33

2 and there I am too, then minus 1 2

01:36:38

is minus also cosine is negative

01:36:44

minus 1 2 minus 1 it will turn out to be

01:36:50

complex problem

01:36:52

40 by 10 minus 3 by 5 by 10 minus 2 by

01:36:59

minus three second, so we

01:37:04

think

01:37:08

40 is minus 3 by

01:37:13

5 10 minus 2

01:37:18

0

01:37:21

0 0 0 3

01:37:26

we are asked for a module by

01:37:32

Weber,

01:37:35

so the modulo delta is

01:37:39

simple 03

01:37:42

color in the world of vi microfiber oh

01:37:52

strange that micro

01:37:56

3000 microfiber

01:37:59

I didn’t make a mistake anywhere guys you also have and

01:38:05

damn why did

01:38:08

n’t I substitute

01:38:15

this with the same with s and with this is Pierre square so

01:38:21

here we need to correct it

01:38:34

so it means b

01:38:37

by 3, 14 by 0 0 5 squared

01:38:43

by minus 1 2 minus 1

01:38:47

in

01:38:59

meetings

01:39:12

so

01:39:19

because

01:39:30

cosine 120 minus one second because

01:39:40

I almost got stuck you

01:39:43

guys have the same answer

01:39:50

471

01:39:53

I ask you the same answer the answer didn’t

01:39:55

write

01:40:04

this I am a

01:40:34

conducting frame with an area of 5 centimeters

01:40:39

5 centimeters square can rotate

01:40:42

in a uniform magnetic field with an induction of

01:40:44

0 3 tesla

01:40:50

first the frame is located relatively

01:40:52

lines of the magnetic field as shown

01:40:55

in the figure, the moment of time t is equal to zero,

01:40:57

the frame begins to rotate uniformly with a

01:41:00

period of 04 in seconds,

01:41:03

after what time after the start of rotation the

01:41:06

magnetic flux penetrating the frame for the

01:41:08

third time will become the largest in modulus,

01:41:13

so look,

01:41:16

here we are rotating, we are rotating this frame,

01:41:21

here is a YouTuber in the third time will be

01:41:26

the largest in magnitude,

01:41:29

so

01:41:31

draw

01:41:37

another one, take it,

01:41:43

well, I have this wire that it’s

01:41:46

twisted,

01:41:54

this wire means that

01:41:57

electromagnetic induction

01:41:59

is directed to the right, the

01:42:05

magnetic flux is directed here, tell me at

01:42:08

the moment the magnetic flux is maximum

01:42:11

or minimum, that’s when I have a

01:42:13

circuit like this directed

01:42:20

at the moment I have zero

01:42:24

zero

01:42:26

then

01:42:29

after a quarter of a period let's immediately

01:42:33

turn with the normal here

01:42:37

my normal is looking here at the

01:42:40

moment after a quarter of a period it

01:42:43

turns here at the moment

01:42:46

maximum the first time it became then here

01:42:50

this is not the initial state because the

01:42:52

normal turned over then here and

01:42:58

then here a period passed, you know, I’ll

01:43:04

repeat again the first time it became

01:43:07

the maximum zero

01:43:09

the second time it became the maximum

01:43:13

0 3 times it became the maximum

01:43:18

how many times we twisted

01:43:23

we twisted means here let’s

01:43:28

just draw like this

01:43:30

it was normal then like this it was

01:43:34

normal and here the maximum flow here is

01:43:37

zero f equals zero here the

01:43:41

maximum then like this

01:43:46

then like this the maximum flow

01:43:52

then like this the period has passed and

01:43:57

like this the maximum flow has become and

01:44:03

every time a quarter of a period passes from here to here, a

01:44:06

quarter of two quarters of three

01:44:08

quarters of a period and another quarter then

01:44:12

there is after a time

01:44:14

equal to the period plus a quarter of the period, that

01:44:19

is, 125 of the period and our period is

01:44:26

0 4 seconds

01:44:29

125 by 0 4

01:44:33

0 5 seconds

01:44:39

everyone got it

01:44:42

[applause]

01:44:52

such things are

01:44:56

not one and a half periods quarter period ii

01:44:59

quarter

01:45:22

because your magnetic

01:45:25

induction vector hits here here is the vector here in

01:45:28

this case, this plane is not there, not a

01:45:32

single vector of magnetic induction

01:45:34

penetrates the plane, so the magnetic

01:45:36

induction of the zero the house will turn, then the entire

01:45:38

plane penetrates the

01:45:53

maximum in modulus of course, a flat

01:45:56

square wire frame with a side of

01:45:58

5 centimeters

01:46:00

is located in the xy xy plane and

01:46:03

is in a uniform magnetic field, the

01:46:06

magnetic field induction vector lies in the

01:46:08

home plane and is directed at an angle of 30

01:46:11

degrees to the x axis. The

01:46:16

figure on the right shows the dependence of the magnitude of the

01:46:18

magnetic induction vector on

01:46:20

time, find the magnetic flux

01:46:22

penetrating the frame at the moment of time three

01:46:25

seconds

01:46:26

three seconds

01:46:34

usa alpha of the

01:46:38

x axis and well, here they are again their angle is not the

01:46:41

one we need, that is, it is not the right

01:46:45

angle, let's call it beta, that

01:46:49

is, and the angle between the normal of the

01:46:52

magnetic induction vector

01:46:54

is not 30 degrees, but 60. Well, it’s

01:46:58

clear that they form a right angle

01:47:01

together in dota alpha and the angle oh beta and the

01:47:04

angle alpha,

01:47:05

well, it turns out that they ask us the magnetic

01:47:09

flux b to c by the cosine alpha,

01:47:13

that is, b we have three seconds at the moment of time

01:47:17

and by the way it is unknown,

01:47:21

we have a linear relationship here b is equal to a

01:47:25

constant multiplied by t so we know

01:47:29

that

01:47:30

tank b2 will relate to b1 to also

01:47:35

as t2 to t1,

01:47:37

it follows that

01:47:40

at a time of three seconds, what we

01:47:44

want to find is divided by the magnetic induction

01:47:47

at a time of 5 seconds, that is, 02

01:47:51

will be treated in the same way as 3 divided by

01:47:54

five, that is, we would

01:48:00

essentially have 0 6 multiply by 0 2 0 12

01:48:06

tesla and then 012

01:48:09

multiply by the area

01:48:13

square frame means

01:48:16

0 0 5 squared

01:48:20

by cosine 60 that is f let's

01:48:25

calculate what is equal to

01:48:33

squared

01:48:39

in micro you and berg are asking for 150

01:48:43

micro

01:48:45

weber

01:48:47

that's

01:49:11

why but by 5 squared you have a

01:49:14

square frame 5 centimeters by five

01:49:17

centimeters,

01:49:18

its area is 0 0 5 squared

01:49:24

28 minutes left we won’t have time to

01:49:27

piss

01:49:29

I didn’t have time

01:49:40

Alexander Su version

01:49:43

a schoolboy read a physical

01:49:45

encyclopedia that the inductance of a

01:49:47

coil wound on a wire is

01:49:49

proportional to the square of the number of turns you

01:49:53

showed you by the way This form of the

01:49:56

rational square of the number of turns and

01:49:59

beads,

01:50:03

the schoolboy soldered into different parts of the

01:50:05

electrical circuit coil number one in

01:50:08

which there were 1200 turns

01:50:11

1200 turns and

01:50:13

potato number two in which there were three

01:50:17

100 turns

01:50:18

it turned out that the current strength in

01:50:21

coil one is two times less than the current strength

01:50:26

in the coil is

01:50:30

22 times less than

01:50:33

the current v2,

01:50:35

how many times do the energies of the

01:50:37

magnetic field stored in the coils differ from

01:50:41

us el1 relates to l2 as n

01:50:47

12 squared according to this formula, that

01:50:51

is, 1200 divided by 300 squared, that is,

01:50:57

16 times, but there one thousand two hundred by three hundred 4

01:51:01

4 in a square is 16 then the

01:51:05

energy in 1 coil is to the energy in the second

01:51:09

coil but it is related as either one and one

01:51:13

square

01:51:14

divided in half by or two and two squared in half

01:51:19

it turns out or 1 or 2 multiplied

01:51:23

by

01:51:25

1 divided by barely

01:51:28

a square that is, it turns out 16 and

01:51:32

1 of 2 1 2 that is, eight times will be

01:51:38

different

01:51:57

[ __ ]

01:51:58

square

01:52:02

four times

01:52:10

so cloning excuse me erasing

01:52:25

yesterday I talked with your curators and was

01:52:28

a little upset that before I

01:52:31

started communicating with them I managed to get drunk

01:52:34

somehow hang out, it’s cool to

01:52:38

tell the curator how to

01:52:40

work correctly you still need to with a sober head it

01:52:42

was hard to gather my thoughts and

01:52:45

work with the curators, it’s like working with

01:52:47

drunk students, it’s much harder

01:52:51

so who

01:53:01

is

01:53:02

George Yenn of Japan for a long time I know many

01:53:06

times I saw him

01:53:27

so okay let’s do it later

01:53:31

[music]

01:53:34

yes all

01:53:37

let’s move on the number of turns of the primary

01:53:40

winding of the transformer twice the

01:53:43

number of turns in the secondary what is the

01:53:46

amplitude of voltage oscillations at the ends of the

01:53:49

secondary winding of the capacitor in

01:53:52

no-load mode when the amplitude of

01:53:54

voltage oscillations at the ends of the primary is 50 volts

01:53:57

we can know its shape that y one on y-2

01:54:00

is equal to n 1 and n 2

01:54:03

therefore y 2 is y1 n2 on n1

01:54:12

that is, it

01:54:14

turns out that

01:54:17

150 an-2 on n 1 1 2 that is, twenty-

01:54:24

five volts

01:54:38

here it promises me stupid almost

01:54:41

kicked out Georges

01:54:43

like this

01:54:46

this summer I want this we have

01:54:50

Georges that is, he began to work like well I

01:54:53

was there, he had to come

01:54:55

somewhere, he went to the camp and it

01:54:58

turns out he didn’t pass the competition, to hell with

01:55:01

crying in George’s tavern immediately and

01:55:03

she folded it immediately, the

01:55:14

voltage fluctuations on the capacitor in the

01:55:17

alternating current circuit are described by the

01:55:19

equations

01:55:20

40 cosine 500 t

01:55:28

where all quantities are expressed in capacitance of the

01:55:32

capacitor c is equal to 6 micro farads

01:55:43

find the amplitude of the current

01:55:52

here the oscillatory circuit on with you

01:55:55

actually appeared otherwise look at the

01:56:00

voltage fluctuations on the voltage

01:56:03

go on the capacitor is described by

01:56:05

the equations

01:56:10

see

01:56:12

then

01:56:14

the charge is the price y and the

01:56:19

derivative of the charge with respect to time is the

01:56:24

current strength

01:56:25

that is, we get the charge,

01:56:32

let's put it here, write 6 by 10

01:56:36

minus 6 by 40 by cosine 500 t and

01:56:44

it turns out 240 by 10 minus 6

01:56:48

cosine of the beginning will be written

01:56:52

246 cosine 500 and

01:56:57

when we take the derivative it

01:56:59

turns out 240 by 10 minus 6

01:57:03

by minus sine

01:57:06

500 t and also multiplied by the derivative

01:57:10

of the contents is 500, that is, then we

01:57:14

get

01:57:16

[applause]

01:57:21

500 by 240

01:57:26

that is, 6

01:57:29

in general

01:57:32

it turns out

01:57:35

0 12 minus sine 500 t and

01:57:42

the maximum then turns out to be 012 amperes, which is

01:57:54

what she distinguished others about,

01:57:57

well, he’s just

01:58:00

for a long time already

01:58:04

one of the first curators has been working longer than anyone

01:58:32

he is thirty years old to the point of being nervous I don’t know

01:58:35

how old he is by the way an

01:58:37

electric current flows through a

01:58:40

coil with an inductance of 6 miles and Henry 6

01:58:44

by 10 V minus the third Henry the graph

01:58:49

shows the dependence of current strength on

01:58:51

time what is energy equal to of the magnetic

01:58:54

field stored in the coil at a time of

01:58:57

15 meters per second

01:59:00

Oleg you are here

01:59:03

interesting time we measure meters per second

01:59:10

I'm afraid your salary will also be

01:59:12

measured in other units

01:59:17

in Indian some

01:59:20

not where we have

01:59:25

high inflation

01:59:27

so okay in 15 seconds probably and in

01:59:34

milliseconds I probably wanted to set it to 15

01:59:37

milliseconds, I just set the fraction to

01:59:40

unscrew it,

01:59:51

which means it turns out to be 15 milliseconds, we have a

01:59:54

current

01:59:56

minus 1 ampere in the other direction,

01:59:59

then the energy of the

02:00:03

potato and the square in half is

02:00:07

simply 6 by 10 minus 3 by 1 by 2, that

02:00:12

is, three miles of joule

02:00:22

yes am I here a baby or our look no matter

02:00:28

what Oleg you are not real or not the

02:01:00

inductor is connected to a

02:01:02

current source with negligible

02:01:05

internal resistance through a

02:01:07

40 m resistor

02:01:11

at the moment t is equal to zero the key is closed the

02:01:14

value of the current in the circuit is measured at

02:01:16

successive moments in time with

02:01:17

accuracy up to 0 0 1 ampere are presented in the

02:01:21

table what is the self-induction emf of

02:01:23

the coil equal to the moment of time of the

02:01:26

coil induction itself

02:01:29

at the moment of time

02:01:32

two seconds and

02:01:35

give in volts, look what

02:01:38

happens to the current, here we connect it,

02:01:42

here the coil

02:01:44

current begins to flow and we have a

02:01:50

self-induction emf

02:01:52

and it turns out while then the coil

02:01:56

resists us and ds minuses ds

02:01:59

self-induction is equal to the current strength by the

02:02:04

resistance multiplied like this, it is

02:02:06

written legal that is, we

02:02:08

weaken the forces and ds induction

02:02:13

weakens the electromotive force of which

02:02:16

any source but this is at first but when

02:02:20

the current is established

02:02:23

it is established what happens what do you

02:02:25

think

02:02:27

the coil ceases to resist

02:02:31

self-induction emf becomes 0 y equals it

02:02:34

turns out that this coil simply

02:02:36

turns into an ideal conductor for us

02:02:39

and ds is equal to r and so we

02:02:42

can find out that this is when our

02:02:45

current stopped changing over time

02:02:47

here here here what we have

02:02:51

current strength

02:02:53

0 3 amperes 0 3 amperes multiplied by

02:02:59

resistance 40 com that is 12 volts and

02:03:04

ds source

02:03:06

then if we take some

02:03:09

other point in time, let’s say that’s

02:03:13

where the beautiful numbers are here,

02:03:18

give this one,

02:03:19

then we can find a charge and even in a

02:03:22

specific request seconds we are asked for 2

02:03:25

seconds here we can substitute

02:03:28

in this formula you

02:03:31

get and ds of self-induction is equal to ds

02:03:34

minus and r that is 12 minus the current strength

02:03:39

we have 026

02:03:41

here 40

02:03:45

to r we have a nonentity here for some reason

02:03:48

not written but it is implied that it is

02:03:50

destroyed

02:03:52

one of 6

02:03:56

1 of 6 volts, this is what the

02:04:00

self-induction emf at their moment is very similar to a

02:04:03

capacitor, only the capacitor at the

02:04:06

initial moment of time is like a

02:04:08

conductor and then turns into

02:04:10

impenetrable, and the coil at the initial

02:04:13

moment with self-induction you

02:04:16

can even see the maximum current 0 initial at t is equal to

02:04:18

zero and then

02:04:20

turns into an ideal conductor, that

02:04:23

is, they work differently but are somewhat

02:04:26

similar in antiphase, so to speak, a

02:04:31

very important task, a very useful

02:04:33

problem,

02:04:38

and

02:04:42

there they wrote that I was a nonentity, but I didn’t

02:04:45

see it,

02:04:53

but to a current source with negligible

02:04:57

with a small internal resistance, you

02:05:00

see again we

02:05:02

despise thermal and the

02:05:19

figure shows a graph of harmonic

02:05:22

oscillations of the current in the oscillatory circuit

02:05:24

if the potato in this circuit is replaced with

02:05:26

another coil whose inductance is

02:05:28

four times greater, then what will be the

02:05:30

oscillation period the oscillation period two spots

02:05:34

root of el on c

02:05:36

if the inductance is four times greater, then the

02:05:40

period is twice as long,

02:05:42

it turns out to be t2, this is 231 here the period we have is

02:05:48

20 microseconds,

02:05:50

which means here it will be 40 microseconds, and

02:06:06

that is,

02:06:13

in the set of

02:06:16

radio components for the manufacture of a simple

02:06:18

oscillating circuit there are two

02:06:20

inductance coils or 102 also two

02:06:23

capacitors c1 c2 c what is the lowest

02:06:26

natural frequency that can be used to make an

02:06:29

oscillatory circuit from two elements of

02:06:31

this set? Express the answer in megahertz,

02:06:34

round to the nearest whole number; the

02:06:37

natural frequency is the

02:06:40

inverse of the period

02:06:42

and

02:06:45

it turns out with what is the lowest

02:06:47

natural frequency;

02:06:49

then this should be the largest, that is,

02:06:52

1 by 2 pi to the root of the

02:06:56

largest means here

02:07:00

we take two micro Henrys and

02:07:05

here we take 40 picofarads

02:07:09

40 beeps 10 -12 with this

02:07:16

in megahertz why do

02:07:20

I need this

02:07:25

some kind of mega

02:07:43

like

02:07:50

17 8 by 10 6 hertz but if you round to the

02:07:55

nearest whole then 18 mega hertz mega is a capital

02:08:00

letter

02:08:01

m small tormented

02:08:03

peak

02:08:06

is 10 -12 on this is 10 minus 9

02:08:22

so we move on

02:08:29

gun oscillatory circuit from a capacitor

02:08:32

with a capacity of 50 microfarads

02:08:35

50 by 10 minus 6 farads and

02:08:39

coils with inductance 2 henry what is the

02:08:44

cyclic frequency of free

02:08:45

electromagnetic oscillations but we know with

02:08:48

you that omega is two pin t

02:08:51

is two pin root and salz, and that is,

02:08:54

one for if not residents one for the root of

02:08:59

50 by 10 minus 6 by 2 and

02:09:06

here, by the way, the normal one is extracted

02:09:09

here 10 minus 4 gets here minus the

02:09:11

second action 100

02:09:14

100 seconds minus the first degree is

02:09:18

correct here I have a hundred I hope minus 6

02:09:23

is 10 minus 4 and there is a backup minus 2

02:09:26

turn over if there are 100

02:09:31

cubic meters there is still about the last task everything

02:09:34

put aside to finish

02:09:55

in the ideal oscillating circuit of a radio

02:09:58

receiver electromagnetic oscillations occur, the

02:10:00

dependence of the current in the coil on

02:10:03

time looks like well, you see,

02:10:05

determine the length of the electromagnetic wave

02:10:07

to which this circuit is tuned guys

02:10:10

means the length of the wave is

02:10:12

equal to the speed of propagation on it, the

02:10:17

period the speed of propagation of the

02:10:20

electromagnetic wave is equal to the speed of light and the

02:10:23

period is calculated by the formula,

02:10:27

well, 2 pi

02:10:29

to 25 elite omega

02:10:33

omega is 2pi divided by t, this is how

02:10:38

it turns out and we the

02:10:41

speed of light with you we know this is 3 by 10

02:10:44

8

02:10:46

2 by 3 14 we substitute omega we take from

02:10:55

from this thing

02:10:57

what is written before t remember

02:11:02

here it turns out to be one and a half

02:11:05

I hope 6 and also pete let's reduce and

02:11:12

I hope 6 and

02:11:17

divide here 3 probe and goes

02:11:26

on to read

02:11:33

303

02:11:37

1200

02:11:41

meters this is a

02:11:44

radio wave that

02:11:49

has a long wavelength, an

02:11:54

electromagnetic wave and

02:11:58

we don’t take it divided by 6 because this is the

02:12:00

initial phase,

02:12:02

so remember taffy zero,

02:12:05

they wrote 100 will be both

02:12:09

this and zero there is simple for

02:12:12

some kind of harmonic oscillations on

02:12:14

sine omega t plus fi 0 here fi 0 from the

02:12:18

initial phase how much is shifted at the

02:12:20

initial moment of time but it doesn’t seem to

02:12:21

affect anything

02:12:24

so well all the guys we’re finishing not the

02:12:27

next stream for a long time I won’t say goodbye for a long time

02:12:29

well done for watching I hope you

02:12:32

liked it you liked today’s

02:12:34

lesson in my opinion it wasn’t very difficult, but

02:12:36

write in the chat if it was difficult for you, it

02:12:39

seems normal to me, although this topic is

02:12:41

one of the most unpleasant in

02:12:45

magnetism and in general in principle, but

02:12:47

because the derivative is these small quantities,

02:12:49

well, I think you’ll figure it out when the theory

02:12:52

may be a bit complicated, but when

02:12:54

it comes to practice, the us

02:12:57

can completely figure it out without any problems,

02:13:00

let’s do it, anyone who doesn’t get it, please

02:13:04

ask the curators why, how, let

02:13:07

them explain to you, watch

02:13:09

the webinar, don’t neglect a very important topic, they

02:13:11

constantly give the

02:13:13

task

02:13:15

sonnets to the school, I was going to

02:13:17

solve the problem quickly, no, I always lost

02:13:20

I lost, but the brake is okay, as long as the analysis is

02:13:25

stronger

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