Current in the circuit will be
|
(a) |
(b) |
(c) |
(d) |
Current in the circuit will be
|
(a) |
(b) |
(c) |
(d) |
(b)
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Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3d. The new value of the force between them is
|
(a) –2F |
(b) F/3 |
(c) 2F/3 |
(d) – F/3 |

Eddy currents are used in
|
(a) Induction furnace |
(b) Electromagnetic brakes |
|
(c) Speedometers |
(d) All of these |
It is easier to start a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery
|
(a) Decreases with rise in temperature |
|
(b) Increases with rise in temperature |
|
(c) Decreases with a fall in temperature |
|
(d) Does not change with a change in temperature |
1 Curie is equal to
|
(a) 3 |
(b) 3.7 |
|
(c) 5 |
(d) 3.7 |