Question

There are two coils $A$ and $B$ as shown in Fig. 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 constant current in the clockwise direction of $A$
• B. There is varying current in $A$
• C. There is no current in $A$
• D. There is constant current in the clockwise direction in $A$

Answer 1

The correct option is D There is constant current in the clockwise direction in $A$

Coil A must be carrying a constant current in counter clockwise directon . Because of that, when moves toward B, current induced in B is counterclockwise direction as per Lenz's law. The current in B would stop when A stops moving.