ElectroMagnetic InductionHard
Question
Two identical circular loops of metal wire are laying on a table without touching each other. The loop A carries a current which increases with time. In response, the loop B
Options
A.remains stationary
B.is attracted by the loop A
C.is repelled by the loop A
D.rotates anout its CM, with CM fixed
Solution
For understanding, let us assume that the two loops are lying in the plane of paper as shown. The current in loop 1 will produced
magnetic field in loop 2. Therefore, increase in current in loop will produce an induced current in loop 2 which produced 
magnetic field passing through it i.e., induced current in loop 2 will also be clockwise as shown in the figure. The loops will now repel each other as the currents at the nearest and farthest points of the two loops flow in opposite directions.
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