question_answer

Two identical circular loops of metal wire are lying on a table without touching each other. Loop A carries a current which increases with time. In response, the loop B :

A) remains stationary

B) is attracted by the loop A

C) is repelled by the loop A

D) Rotates about its CM, with CM fixed

Correct Answer: C

Solution :

The antidockwise current in loop 1 will produce magnetic field in loop 2 in downward direction. A increase in current in loop 1 will produce an induced current in loop 2 which will produce magnetic field. So induced current in loop 2 will be in anticlockwise direction. Thus loops will repel each other for the reason of currents in the two loops.