First slide

Lenz's law and conservation of energy

Question

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

Difficult

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

Solution

See fig When the current in loop A is
increased, the magnetic flux associated with loop B changes. The direction of induced current in B is that of current in loop A (according to Lenz's law). So, the top faces of both the loops will behave like the poles of same nature. Hence loop B is repelled by loop A.

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