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Q.

Three coaxial circular wire loops and an stationary observer are positioned as shown in figure. From the observer's point of view, a current I flows counter clockwise in the middle loop, which is moving towards the observer with a velocity v. Loops A and B are stationary. The same observer would notice that:

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a

Clockwise currents are induced in loops A and B.

b

Counter clockwise currents are induced in loops A and B.

c

A clockwise current is induced in loop A, but a counter clockwise current is induced in loop B.

d

A counter clockwise current is induced in loop A, but a clockwise current is induced in loop B.

answer is C.

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Detailed Solution

The magnetic flux in loop A  will increase while the magnetic flux in loop B will decrease. By Lenz's law, the induced current in loop A will tend to decrease the flux in loop A and induced current in loop B will tend to increase the flux in loop B.  So clockwise current is induced in loop A.  and anticlockwise current in loop B. Hence option (3) is correct.

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