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Q.

There are two coils A and B as shown in figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counter clockwise. B is kept stationary when A moves. We can infer that

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a

there is a constant current in the clockwise direction in A.

b

there is a constant current in the counter clockwise direction in A.

c

there is a varying current in A.

d

there is no current in A.

answer is D.

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Detailed Solution

When coil A moves towards coil B with constant velocity, so rate of change of magnetic flux due to coil B in coil A will be constant that gives constant current in coil A in same direction as in coil B by Lenz's law.

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