Electromagnetic Field Theory
The magnitude of the induced emf in a conductor depends upon on the

 flux density of the magnetic field.
 rate of change of flux linkage.
 amount of flux linkage.
 amount of flux cut.

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Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

 equal to that of disc and in the opposite direction.
 less than that of disc and in the same direction.
 equal to that of disc and in the same direction.
 less than that of disc but in opposite direction.

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