A bar magnet is rotated on a shaft near a coil which is
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a) When the magnet is rotated about its own axis, then due to symmetry of magnet the magnetic flux linked with circular coil remains unchanged, hence no emf is induced at terminals of coil.
(b) When the magnet is rotated about an axis perpendicular to th length the positions of N and s poles of magnet changes continously; so the magnetic flux linked with the coil changes continuously; hence the emf is induced at the terminals of the coil.
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