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Mutual Induction

A square coil...

Question

A square coil ABCD lying in x-y plane with its centre at origin. A long straight wire passing through origin carries a current i = 30 t in negative z-direction. The induced current in the coil is

Clockwise

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Anticlockwise

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Alternating

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Zero

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Solution

The correct option is D Zero
Magnetic lines are tangential to the coil as shown in figure. Thus net magnetic flux passing through the coil is always zero or the induced current will be zero.

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