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 counterclockwise. `B` is kept stationary when `A` moves. We can infer that

Options

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 counterclockwise direction in A

Answer

D

Explanation

The current in B is counterclockwise and A is maving towards B. This means that the current in A is also counterclockwise such that the induced current in B opposes the motion of A towards it by repelling it.