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F. F. P.62. Magnetic force on currents. N. N. I. I. S. S. P.62. Fleming’s left-hand rule. P.62. Magnetic field becomes stronger on the top. Neutral point. Magnetic field becomes smaller at the bottom. P.62. To have greater induced magnetic force:. Increase current.

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Presentation Transcript
slide1

F

F

P.62

Magnetic force on currents

N

N

I

I

S

S

slide2

P.62

Fleming’s

left-hand rule

slide3

P.62

Magnetic field becomes

stronger on the top

Neutral point

Magnetic field becomes

smaller at the bottom

slide4

P.62

To have greater induced magnetic force:

Increase current

Stronger magnetic field

slide6

I

N

S

N

S

P.63

slide7

F

F

P.63

Conducting wire with a permanent magnet

N

N

I

I

S

S

slide8

F

F

x

x

x

x

x

I

I

x

x

x

x

x

F

F

.

.

.

.

.

.

.

.

.

.

x

x

x

x

x

.

.

.

.

.

.

.

.

.

.

I

I

x

x

x

x

x

P.62

slide10

.

x

.

x

.

F1

x

I1

I2

P.63

slide11

.

x

.

x

.

F2

x

I1

I2

P.63

slide12

.

x

.

x

.

F1

x

I1

I2

P.63

slide13

.

x

.

x

.

F2

x

I1

I2

P.63

slide14

P.63

Attractive force

Repulsive force

slide16

P.63

N

N

F

F

v

v

I

S

S

slide17

P.63

Aurora

slide19

P.64

The rod moves to LHS.

slide20

P.64

The rod moves to RHS.

slide21

P.64

No current on metal rod. The rod remains at rest.

slide22

P.65

X : North, Y : South

Out of the paper

More magnetic field lines

The force is reversed in direction

No change in direction

slide28

P.66

0

0

0

Anticlockwise

0

0

0

Clockwise

slide29

F

-F

P.67

A couple is formed

D.c. motor

Commutator

rotates

with the coil

slide30

P.67

Current flows from A to B

slide32

P.68

Use a stronger

magnet

Use larger current

Motor can be

more powerful

Increase number of

turns per unit length of coil

Use soft-iron core

slide33

.

F

.

x

-F

x

P.68

Couple is

constant

slide34

.

.

N

S

.

x

x

x

P.68

Large number

of turns of wire

Several coils

Soft-iron core

Increase power &

run more smoothly

slide35

Sound

wave

P.68

Loudspeaker

slide36

P.68

Solenoid

Circular

magnet

Paper cone

slide37

N

N

N

S

N

N

N

N

N

P.68