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Опыт Эрстеда

Сила Ампера

Правило левой руки

Взаимодействие токов

00:00:06

you are familiar with what is on this

00:00:09

table the wire under it the magnetic needle

00:00:12

next to the current source what kind of experiment this is what is it

00:00:16

called magnetic action just

00:00:23

who performed this experiment in 1820

00:00:27

oersted oersted

00:00:30

oersted's experiment means we found out with you

00:00:34

in the lesson following r with ted through for many

00:00:37

years that if a current flows through a conductor, it

00:00:41

creates a magnetic field around itself; a

00:00:43

magnetic needle located in this

00:00:45

field experiences an action; a magnetic

00:00:49

needle experiences the action of a magnetic

00:00:50

field; or, more simply, a conductor with current

00:00:52

acts on a magnetic needle and the

00:00:55

magnetic needle turns; you

00:00:57

can see this for us again this is already

00:01:01

familiar, for example, I turn on the current, the arrow

00:01:09

rotates, and so the conductor with current

00:01:12

acts on the magnet at the arrow,

00:01:14

and now we will argue a little

00:01:18

differently in nature, there is no action,

00:01:21

only action in nature,

00:01:24

there is always interaction, therefore,

00:01:26

if the conductor with current acts on the

00:01:29

magnetic needle, please tell me a

00:01:32

magnetic needle acts on a conductor

00:01:34

with current, of course it acts, how does this

00:01:38

happen, you know very well that a

00:01:40

magnetic needle is a small magnet,

00:01:42

it creates a magnetic field around itself,

00:01:44

this magnetic field is around the

00:01:47

needle, including where

00:01:49

the conductor is located, which means the conductor with current

00:01:51

is in the magnetic field of the needle and we

00:01:55

clearly see how the conductor acts on the

00:01:58

arrow, but we can’t see how the arrow

00:02:00

acts on the conductor, but it’s

00:02:02

just that the conductor is fixed

00:02:05

and in general the force with which they

00:02:07

interact is very small.

00:02:10

Today we will increase this force so much that

00:02:12

it becomes noticeable and we will study its properties.

00:02:15

The topic of today’s lesson sounds So the

00:02:19

effect of a magnetic field on a conductor carrying

00:02:22

current is the topic of the

00:02:28

effect of a magnetic field on a conductor carrying

00:02:41

current.

00:02:51

rule of the left hand rule of the left hand

00:03:10

homework for tomorrow summary from

00:03:20

Peryshkin's textbook paragraph 62

00:03:24

but not entirely only on page 180 181

00:03:36

what is written next we

00:03:38

will look at in more detail tomorrow so that

00:03:40

you don't lose interest in the material you do

00:03:43

n't have to read further if you read

00:03:45

nothing bad there will be no further problems on

00:03:49

Lukashik with

00:03:54

task number 1480 1483 on Kirik

00:04:07

on Kirik for 8th grade problems and with

00:04:11

numbers from 3 to 6 3 interest 6 of a

00:04:16

sufficient level page 89

00:04:23

obligatory with drawings

00:04:27

if there are no drawings homework

00:04:30

will not be

00:04:32

counted but now our task to see

00:04:39

how a magnetic field acts on a

00:04:41

conductor with current,

00:04:42

for this, firstly, we probably need to

00:04:46

take a more powerful source of magnetic field instead of a magnetic needle;

00:04:51

we have such a magnet here,

00:04:54

the pole is not labeled, which means we

00:04:56

will need to find out the poles of this magnet once

00:04:58

again

00:05:00

in order to we saw that a

00:05:02

force acts on the conductor, we can

00:05:05

give this conductor a little

00:05:08

opportunity to sag so that it

00:05:12

is clear where the current flows, I will

00:05:15

use this plate, which is already known to you,

00:05:17

and we will

00:05:20

place it in the direction of the current in the

00:05:22

conductor. start since

00:05:24

we have not signed the poles of the magnet,

00:05:27

let's first determine the poles of the magnet,

00:05:30

give a close-up, you have a magnetic

00:05:37

needle, how to determine the poles of a magnet,

00:05:41

Sasha, bring the magnet to the magnetic needle,

00:05:46

so I bring the magnet to the magnetic needle,

00:05:49

we can see which pole it is, the north one, it’s

00:05:54

blue, so that means this which pole of

00:05:58

which letter is marked the south pole c

00:06:01

means this is our south pole and this is the

00:06:05

north

00:06:06

north pole we will mark with the letter na m

00:06:12

to the south pole

00:06:17

we marked with

00:06:18

the letter s like this thanks to the magnetic

00:06:26

needle we no longer need it now

00:06:29

let's look at the polarity of

00:06:31

connecting the current source this is the

00:06:36

positive terminal of the current source,

00:06:39

this is the current going here and then it goes like this, the

00:06:42

current flows from the positive pole to

00:06:45

the negative, that is, in this

00:06:47

direction now we will place

00:06:51

the magnet this way, the north pole is

00:06:56

on top of the magnetic field lines as they

00:07:01

are located in relation to this magnet

00:07:03

now they are coming out of the north pole

00:07:07

looking for magnetic field lines coming out of the

00:07:09

north pole the current flows here until it doesn’t

00:07:12

flow turning on the current turning off it means the

00:07:18

conductor was affected by a force directed towards me

00:07:22

now let’s try to change

00:07:25

the direction of the magnetic field now the

00:07:28

magnetic lines were coming out,

00:07:30

that is, the field was directed upward but

00:07:33

magnetic the lines enter the south pole,

00:07:37

we turn on the current in the same direction, the

00:07:41

conductor with the current is deflected towards you, and that

00:07:45

is, the conductor with the current is acted upon by a force in the

00:07:49

direction of which depends on the

00:07:51

direction of the magnetic field,

00:07:53

now this field is directed downward and the current

00:07:59

is directed to the left, the strength of the current is directed in

00:08:03

this direction

00:08:04

as I show with the help of this arrow,

00:08:07

the force is directed towards you and what if we

00:08:10

now change the direction of the current,

00:08:12

rearrange the

00:08:16

poles of the current source, swap them like

00:08:18

this, now this is the

00:08:33

positive pole, the current flows here,

00:08:42

turn on the current arrow, the wire has deviated in

00:08:46

this direction,

00:08:47

change the polarity of the magnetic field,

00:08:50

direction magnetic field, the magnetic

00:08:52

field is directed upward, so the current flows here to the right,

00:08:56

sat down on the right here, and so,

00:09:04

firstly, a

00:09:07

force acts on a conductor with a current located in a magnetic field. This

00:09:10

force has its own name, it is called

00:09:12

ampere force, and so we write on a conductor with a

00:09:17

current

00:09:18

located in a magnetic field a

00:09:23

force acts on a current-carrying conductor located in a

00:09:28

magnetic field to act a force

00:09:33

called ampere force ampere force

00:09:48

in the tenth grade we will learn to calculate the

00:09:51

magnitude of the ampere force for

00:09:53

now our task is to find out how to

00:09:57

determine the direction of the ampere force

00:10:00

let's do the following,

00:10:02

make a drawing and then turn this drawing

00:10:07

in reality, putting the experiment in

00:10:11

accordance with this figure right here

00:10:13

right now, so let's say we have a

00:10:17

magnet, here is its north pole, and

00:10:30

here is its south pole

00:10:46

from the magnetic field line, as you know,

00:10:51

it comes out of the north pole, enters the

00:10:53

south direction of the magnetic field,

00:10:56

we will show it using magnetic lines from above

00:11:02

from the north to the south further they go

00:11:04

inside the body of the magnet, they close somewhere, they

00:11:07

end up here and there and we won’t show it any

00:11:10

further, let’s place a conductor between the poles of

00:11:14

the magnet, this conductor is

00:11:26

located in a magnetic field, like this

00:11:36

we will pass through this conductor like

00:11:39

this here we have there will be a positive

00:11:47

pole of the current source plus a negative one here,

00:11:57

this is the circuit, the current will flow through the

00:12:02

conductor from the positive pole to

00:12:04

the negative, that is, this is how the current field is

00:12:14

directed downward, the current is directed away from us,

00:12:16

let's implement this situation in

00:12:21

practice, we need to create such a

00:12:24

magnetic field so that the magnetic

00:12:26

field lines are are directed downwards, therefore

00:12:29

we

00:12:31

place this magnet with the south pole like

00:12:34

this, the magnetic field lines enter the south

00:12:38

pole, they come out from here and this is

00:12:41

how they close and enter here, which

00:12:43

means the south pole is down, now we

00:12:48

need the current to go there, we

00:12:51

will now use this camera to show the current

00:12:54

I have to go there for this, I have to

00:12:56

change the polarity of turning on the current source,

00:13:01

change the polarity to the opposite,

00:13:17

connected,

00:13:20

check the positive pole,

00:13:25

look, the positive pole from the

00:13:31

positive pole, the wire goes here,

00:13:34

then goes along this conductor along

00:13:38

the arrow, then the lines enter

00:13:41

down, the current flows from us, turn on the current where

00:13:47

it moved conductor to your left the current

00:13:58

flows from us the conductor has moved to the left

00:14:01

therefore the ampere force

00:14:04

is directed to the left the ampere force we

00:14:08

will denote

00:14:09

f with the index and the ampere force is the force

00:14:14

acting on the conductor with current in a

00:14:16

magnetic field

00:14:17

and now let's try to

00:14:21

formulate rules that will allow

00:14:24

us to determine the direction strength hint

00:14:30

is written here the

00:14:31

rule of the left hand means we will use the

00:14:35

left hand coolers white hand in a cast

00:14:40

well a real boy is the one who has never

00:14:45

broken down not yet a real boy yes that

00:14:48

means look we will place the left hand so

00:14:53

that the magnetic field lines enter the

00:14:56

palm the

00:14:58

magnetic field lines enter the palm but

00:15:02

At the same time, I can twist my palm as

00:15:03

I like, we introduce a restriction: place 4

00:15:07

extended fingers in the direction of the current;

00:15:11

place 4 extended fingers in the

00:15:14

direction of the current; then the thumb is bent 90

00:15:17

degrees; the thumb will show

00:15:18

the direction of the ampere force; what we have just

00:15:22

formulated, that is, the rule of the

00:15:25

left hand,

00:15:26

so write down the rule of the left hand

00:15:31

rule of the left hand maxim this right

00:15:36

hand the right is best used for

00:15:41

another to determine the direction of the

00:15:43

magnetic field if the top is known and so

00:15:45

the rule of the left hand

00:15:47

if you place the left

00:15:50

hand like this maxim write

00:15:54

if you place the left hand so that the

00:16:00

lines of the magnetic field enter the palms

00:16:04

if you place left hand so that the

00:16:08

lines of the magnetic field enter the palms

00:16:15

a4 extended fingers

00:16:19

indicate the direction of the current in the conductor

00:16:24

a4 extended fingers indicate the

00:16:27

direction of the current in the conductor then a4

00:16:33

extended fingers indicate the direction of the

00:16:35

current in the conductor then the thumb is bent 90

00:16:39

degrees then the

00:16:44

thumb bent 90 degrees will show

00:16:48

the direction of the force acting on the

00:16:54

conductor

00:16:55

then the thumb bent 90 degrees

00:16:58

will show the direction of the force

00:17:03

acting on the conductor in parentheses the ampere forces

00:17:09

will show the direction of the force acting on the

00:17:12

conductor ampere forces are written down

00:17:19

now let's play a little with

00:17:22

these rules now I'm a magnet and the source

00:17:27

just turned off Roma can you

00:17:36

please Somehow place a magnet with

00:17:39

any pole to the top as you want,

00:17:44

place it under the conductors so choose

00:17:48

the direction of the current you want, well put

00:17:53

the arrow in place like that, now

00:17:58

we check the direction of the current plus here the

00:18:01

current flows here so we give a close-

00:18:07

up of the rum your task is

00:18:11

to predict where

00:18:13

the conductor will deviate when we pass along

00:18:16

it only in this direction prove I do

00:18:22

n’t believe where your left hand is so

00:18:27

bring it closer here once place your palm so

00:18:30

that the lines enter the palm the lines

00:18:34

come out of the north pole until placed

00:18:37

they go like this place the palm so

00:18:39

that the lines enter the palm you need to

00:18:41

bend it, turn it, align your palm, they are

00:18:44

coming here now, just don’t

00:18:47

break your arm, we already have one, so

00:18:49

now 4 extended fingers should be

00:18:52

directed in the direction of the current, where the current

00:18:54

flows here, turn it, well done,

00:18:59

this finger shows the direction of the

00:19:02

ampere force, our conductor should deviate

00:19:03

where

00:19:04

to us to us turn on the current

00:19:10

works thank you you did it sit down

00:19:12

please we know the

00:19:21

notation system to us from us and now

00:19:24

let’s instead of

00:19:28

actually experimenting

00:19:29

let’s work with drawings

00:19:31

after all in homework problems and on

00:19:34

tests you won’t have

00:19:36

the equipment directly and so let the

00:19:39

magnetic field be directed like this,

00:19:48

this is the north pole, this is the south pole of

00:19:59

the north, the south, here are the poles of the moment,

00:20:03

the conductor with current is

00:20:06

placed like this, it is

00:20:15

known that the ampere force acts on it,

00:20:18

directed like this, you need to

00:20:26

indicate the direction of the current in the conductor, you

00:20:31

need to determine the direction of the current in the

00:20:33

conductor

00:20:34

Dima Laktionov please show the

00:20:51

direction of the magnetic lines with an arrow

00:20:54

so good correct and northern views

00:20:58

stand so that it is visible so that

00:21:01

they would like in the house like this the ampere strength

00:21:08

is shown with the thumb

00:21:12

turning it so that so excuse me like

00:21:16

this where the current is directed the ampere strength

00:21:20

is directed downwards left hand and then

00:21:24

four fingers began to point out that everything is

00:21:27

just going up well, so thank you,

00:21:31

sit down, please, the

00:21:37

next task is a conductor with current,

00:21:48

I no longer show it in three-dimensional

00:21:51

form, but I show it using

00:21:53

notations, here is the direction of the magnetic

00:21:56

field, the field of

00:22:07

current, you need to determine the direction of the ampere force,

00:22:14

you need determine the direction of the ampere force

00:22:16

Kolya so the ampere shows here

00:22:51

why out of habit the left hand guys

00:22:58

immediately remember and the most common

00:23:01

mistake in such problems is to confuse the

00:23:03

left wire the left hand is where the heart is the

00:23:06

ampere force is directed to the left so write

00:23:11

f ampere is good so check the lines are

00:23:19

included palm left hand so the current is

00:23:23

bent away from us by 90 degrees finger

00:23:25

shows the direction of the ampere force Kolya

00:23:27

thank you sit down next exercise

00:23:34

the current in the conductor

00:23:37

is directed here is the conductor with the current the current is

00:23:42

directed like this the

00:23:44

current

00:23:47

magnetic field is directed let's

00:23:51

do this I'll draw the

00:23:52

north pole of the magnet here and let's say the south pole

00:23:57

below northern top southern who wants

00:24:03

this board Sasha wanted

00:24:08

left ti today I can’t call so well I

00:24:13

wonder where the ampere force is directed

00:24:16

just stand so that

00:24:17

the audience can see the lines of the magnetic field

00:24:23

please show with iq arrows they leave the

00:24:26

north pole and enter the south pole so

00:24:36

now you need to direct 4 outstretched fingers in the

00:24:39

direction of the current so that

00:24:41

the lines of the magnetic field enter the palm of your hand,

00:24:46

you yourself wanted to in anguish, but now don’t you have

00:24:50

four fingers directed towards the flow from the

00:25:01

magnet, but there are some wires

00:25:04

that lead og, let’s say one

00:25:07

conductor, here’s the second current flows from bottom

00:25:09

to top, which means there is a negative pole here, a

00:25:11

positive pole of volts, everything is possible in

00:25:14

this life, come on, stand a little here to

00:25:21

me, stones of stone, so somewhere the left hand, 4

00:25:25

outstretched fingers must be directed in the

00:25:27

direction of the current so that the lines of the

00:25:29

magnetic field enter the palm, you can do it,

00:25:34

no you can’t what's the matter, please sit down,

00:25:38

I made fun of you a little,

00:25:39

I'm sorry, but you yourself wanted to go

00:25:41

out

00:25:42

guys, it's impossible to position the palm so

00:25:46

that at the same time four outstretched

00:25:48

fingers show the current and the magnetic

00:25:51

field lines enter the palm, you know what this

00:25:53

means, otherwise it means that in this

00:25:56

case the ampere force will not act on the conductor,

00:26:00

I have already said that in the tenth grade we

00:26:03

will be able to calculate the

00:26:05

ampere force, you already know what

00:26:08

sine is, know

00:26:10

the sine of the angle between the direction of the current and the

00:26:13

field, the formula for the ampere force is included

00:26:17

if the angle between the current and the direction of the

00:26:20

field is zero then sine 0 0 and the power of the

00:26:23

ampere does not act, remember and do not

00:26:26

fall for this bait as never before,

00:26:28

if the current flows in the direction of the magnetic

00:26:30

field, the power of the ampere does not act, it is equal to

00:26:33

zero, but if the conductor is oriented

00:26:37

at some angle,

00:26:38

then the power of the ampere, attention, this must be remembered is

00:26:42

perpendicular to two at once directions, the

00:26:44

ampere force is perpendicular to the direction of the

00:26:47

magnetic field and the ampere force

00:26:49

is perpendicular to the direction of the current, so

00:26:53

look, we can draw such a picture,

00:26:58

let’s say

00:26:59

the field is directed like this, I’ll draw again

00:27:05

the poles of the magnet, the field is directed like

00:27:16

this, and the conductor is located, for example, like

00:27:21

this,

00:27:28

it is located at a certain angle and

00:27:32

let’s say there is a current through it current flows in this

00:27:35

direction, the

00:27:36

ampere force will be simultaneously

00:27:41

perpendicular to both the current and the field, that is, the

00:27:46

ampere force should be perpendicular to the

00:27:48

conductor on one side and on the other

00:27:50

hand it should be perpendicular to the

00:27:52

floor f ampere like this, let's

00:27:57

reflect this circumstance in writing the

00:28:01

ampere force will be perpendicular to the direction of

00:28:07

the field

00:28:09

but here is the stand it is tf ampere well

00:28:20

correct perpendicular to the direction of the

00:28:22

magnetic field by the way and I already

00:28:27

told you the beech which is denoted by

00:28:29

the magnetic field called the letter b this

00:28:33

vector is called the vector of magnetic

00:28:35

induction here is the vector b and the ampere strength

00:28:42

the vector is perpendicular to the direction of the current the

00:28:50

direction of the current the ampere strength is

00:28:54

perpendicular to two directions at the same time

00:28:58

field and current like this here is one

00:29:03

right angle between the ampere force and the

00:29:06

conductor here is the second right angle between the

00:29:09

ampere force and the field

00:29:14

now that you know all this let's

00:29:17

look at one interesting problem

00:29:28

remember we gave the definition of

00:29:30

ampere and there we were talking about two infinitely

00:29:34

long parallel conductors

00:29:36

located at a distance of

00:29:38

1 meter from each other, and it was said

00:29:40

that if a current of 1 ampere flows through them, they

00:29:43

interact with a force of two by 10 minus 7

00:29:45

newtons for each meter of length, let's

00:29:48

see now how this happens in

00:29:50

more detail, let's say we have one

00:29:53

conductor and the second conductor,

00:30:03

let's say through this conductor the current flows in

00:30:06

this direction and through this conductor the

00:30:11

current flows in this direction

00:30:16

this conductor 1 this conductor 2 by the way,

00:30:21

you can ensure such a distribution of

00:30:23

currents by connecting these conductors here

00:30:26

then the current flows here and flows out from here

00:30:30

you can even turn it on here current source

00:30:33

minus plus like this and now let's

00:30:41

think like this: current flows through the conductor, it

00:30:45

flows, which means it creates a

00:30:48

magnetic field around itself, how to determine the

00:30:50

direction of the magnetic field using the

00:30:51

right hand rule,

00:30:54

then the current flows here 4 fingers

00:30:58

show the direction of the magnetic field,

00:31:00

here is one line of the magnetic field

00:31:03

and us I'm interested in how the

00:31:09

magnetic field is directed where the second

00:31:11

conductor is,

00:31:12

let's draw a second line of the magnetic field,

00:31:19

it's directed like this and the first

00:31:24

conductor creates a magnetic field and the

00:31:27

second conductor

00:31:28

turns out to be immersed in this magnetic

00:31:31

field, since the conductor with the current is in the

00:31:34

magnet, then the force of the era should act on it

00:31:36

Let's use the

00:31:39

left hand rule to determine the

00:31:41

direction of the ampere force, and so at this

00:31:44

point, where the second conductor is located,

00:31:47

the field is directed away

00:31:50

from us, but I will already write the vector b, the

00:31:58

current flows here, we take our left hand

00:32:03

and position it so that the lines of the

00:32:06

magnetic field enter the palms from us

00:32:10

magnetic field lines enter the palms

00:32:12

4 extended fingers in the direction of the current

00:32:16

there is a finger bent 90 degrees

00:32:19

shows the direction of the ampere force where it is

00:32:22

directed to the right carries the force acting

00:32:25

on the first conductor

00:32:26

we will denote rf1 directed to the right and now let's

00:32:33

look at this picture from the other side

00:32:35

we are now We assume that the

00:32:38

magnetic field is created by the first

00:32:41

conductor and the second is immersed in this

00:32:43

magnetic field, and now let's count

00:32:45

the other way around, because current flows to the conductor, it flows,

00:32:47

it creates a magnetic field,

00:32:51

let's show the lines of this magnetic

00:32:53

field, and I'll take the leg and change the color,

00:32:55

so the current flows from top to bottom according to the

00:33:00

right-hand rule right hand the magnetic

00:33:04

field lines are directed like this let's draw a

00:33:06

magnetic field line

00:33:07

I'll just draw one here it is here it

00:33:17

means here the magnetic field created by the

00:33:20

second wire

00:33:22

where the first wire is located is

00:33:23

directed away from us b4 outstretched fingers

00:33:32

show the direction of the current up the

00:33:37

magnetic field lines enter the palms

00:33:40

ampere strength the ampere force

00:33:45

acting on this conductor from the side of

00:33:49

this f2 is

00:33:51

directed to the left and so the conductors

00:33:54

repel

00:33:55

if oppositely directed currents flow through two parallel conductors,

00:34:02

they repel each other, which

00:34:06

means that if you, for example, have a

00:34:08

flexible wire, then if you leave it to

00:34:12

itself it will turn around a

00:34:16

current source in the ring, this is a closed circuit,

00:34:19

that is, if I take, for example, this

00:34:21

conductor and it just

00:34:26

lies like this and I pass a very large current through it,

00:34:30

it will probably burn out, but if you take a

00:34:33

conductor that can withstand this current, then the

00:34:35

magnetic field created by individual

00:34:38

sections of the conductor will act

00:34:40

on other areas so that it will

00:34:42

tend to turn into a ring, this is an

00:34:44

interesting property: the area of

00:34:47

such a circuit tends to become as large as possible

00:34:51

and vice versa, if the currents flow in the

00:34:54

same direction, then these conductors will

00:34:58

attract each other now we

00:35:00

will not show this, but this is not difficult

00:35:02

to understand using the right-hand rule, the

00:35:04

left-hand rule, these parallel

00:35:06

currents attract, imagine a

00:35:13

massive thick conductor through which a

00:35:16

very large current flows, individual pieces

00:35:19

of the conductor can be considered as

00:35:21

wires put together,

00:35:23

parallel currents flow through them, how they

00:35:25

interact with each other, they

00:35:28

attract, which means if along the conductor

00:35:31

pass a very large current, then the

00:35:34

internal magnetic forces will

00:35:36

tend to compress this conductor, and

00:35:38

it turns out that when a

00:35:40

current of tens of thousands of amperes or

00:35:43

millions of amperes flows through the conductor, this happens in some

00:35:45

physical experiments, this wire

00:35:47

tends to shrink and can, in principle, even

00:35:49

collapse due to the fact that individual

00:35:52

sections the conductor is in the magnetic

00:35:55

field of other sections of the conductor, well,

00:35:58

let’s literally have two more

00:36:00

minutes, let’s solve one problem from the problem book, this is

00:36:15

number one, a sufficient level for anyone who wants

00:36:26

the board, I’ll

00:36:28

redraw the picture to

00:36:36

save time with n on the inside of the wire and there

00:36:49

is such a mysterious plus sign here you

00:36:54

can draw a cross and straight and

00:36:56

tilts hold the chalk what is asked in

00:36:59

which direction the conductor should move the direction

00:37:04

could daphnius so the direction is

00:37:08

only there to the right just write more clearly I will

00:37:14

draw the vector of force and sign that

00:37:17

this force is an ampere

00:37:20

so the ampere

00:37:24

we check become the side of the

00:37:27

magnetic field lines are included in palm current

00:37:29

is directed away from us

00:37:30

ampere power is directed here everything

00:37:33

is correct the lesson is over we drink tea black

00:37:51

well this will be the rules rules of the lion or

00:37:55

left hand

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