Question

There are two coils $A$ and $B$ as shown in figure. $A$ current start flowing in $B$ as shown when $A$ is moved towards $B$ and stops when $A$ stops moving. The current in $B$ is counterclockwise. $B$ 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 no current in A
• C. There is a varying current in A
• D. There is a constant current in the counterclockwise direction in A

Answer 1

The correct option is D

There is a constant current in the counterclockwise direction in A

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

Final Answer: Option (d)