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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
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
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
N S v F N S I v F
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
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
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