A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then :

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a current will be induced in the coil

no current will be induced in the coil

an emf and a current both will be induced in the coil

none of the above

answer is B.

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Detailed Solution

Magnetic flux linked with the coil does not change if magnet is rotated about it's own axis, emf does not induced. So induced current is zero.

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