Magnetic force on currents N S I F N S I F P.62 Fleming’s left-hand rule P.62.

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Presentation transcript:

Magnetic force on currents N S I F N S I F P.62

Fleming’s left-hand rule P.62

Magnetic field becomes stronger on the top Magnetic field becomes smaller at the bottom Neutral point P.62

To have greater induced magnetic force: P.62 Increase current Stronger magnetic field

P.63

N S N S I

Conducting wire with a permanent magnet N S I F N S I F P.63

I I I I xxxx xxxxx xxxxx xxxxx x P.62 F F FF

P.63

I1I1 I2I2 x... x x F1F1

I1I1 I2I2 x... x x F2F2

I1I1 I2I2 x... x x F1F1

I1I1 I2I2 x... x x F2F2

Attractive forceRepulsive force

P.63

N S v F N S I v F

Aurora P.63

P.64

The rod moves to LHS.

P.64 The rod moves to RHS.

P.64 No current on metal rod. The rod remains at rest.

P.65 X : North, Y : South Out of the paper More magnetic field lines The force is reversed in direction No change in direction

P.65

P.62

P.66

0 00 Anticlockwise 0 00 Clockwise

D.c. motor F -F A couple is formed Commutator rotates with the coil P.67

Current flows from A to B P.67

Motor can be more powerful Use a stronger magnet Use larger current Increase number of turns per unit length of coil P.68 Use soft-iron core

x. x. F -F Couple is constant P.68

NS Several coils Soft-iron core Large number of turns of wire Increase power & run more smoothly x. x. x. P.68

Loudspeaker Sound wave P.68

Solenoid Paper cone Circular magnet P.68

S N N N N NN N N

P.70

P.71