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Q.

The north pole of a bar magnet is moved swiftly downward towards a closed coil and then second time it is raised upwards slowly. The magnitude and direction of the induced currents in the two cases will be of

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a

First case                        Second caseLow value clockwise        Higher value anticlockwise

b

First case                        Second caseLow value clockwise          Equal value anticlockwise

c

First case                        Second caseHigher value clockwise        Low value clockwise

d

First case                        Second caseHigher value anticlockwise     Low value clockwise

answer is D.

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Detailed Solution

When it is moving towards the coil, the field lines enclosed in it will be increasing (using Lenz’s Law).To counter the change the induced current in the coil will be in anticlockwise direction.When the bar magnet is moving away, field lines will be decreasing and the induced current will be in clockwise direction.
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