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Q.

The magnet in fig. rotates as shown on a pivot through its center. At the instant shown, what are directions of the induced currents

The magnet in fig. rotates as shown on a pivot through its center. At the  instant shown, the directions of the induced currents are: <img  src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_XII_V01_C04_E01_248_Q01.png"  width="80%">

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a

A to B and C to D 

b

B to A and C to D 

c

A to B and D to C

d

B to A and D to C

answer is A.

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Detailed Solution

N pole moves closer to coil CD and S pole moves closer to coil AB on rotation of magnet.

According to Lenz's law, N pole should develop at the end corresponding to C.

 Induced current flows from C to D 

Also S pole should develop at the end corresponding to B

 Induced current flows from A to B.

Therefore the answer is (1)

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