Question

There are two coils A and B as shown in the 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

• A. There is a constant current in the clockwise direction of 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 1

Answer: (D)

There is a constant current in the counterclockwise direction in A.

Answer 2

Coil A must be carrying a constant current in counter clockwise direction because of that when A moves towards B, current induced in B is counterclockwise direction as per Lenz’s law the current in B would stop when A stops moving.