# 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 (a) there is a constant current in the clockwise direction in A. (b) there is a varying current in A. (c) there is no current in A. (d) there is a constant current in the counter clockwise direction in A.

The answer is the option (d)

The problem infers that there is a constant current flowing in coil A, as when it is moved relative to coil B, the flux linked to B due to A is changed. This induces an emf in B, and hence current starts flowing. But when A is stopped there is no change in flux and hence no current would be induced in the coil B. Whereas, if there were a changing current in the coil A, then due electromagnetic induction, there would have been an emf generated in B.

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