Electromagnetic Field Theory
Conductor is varying and field is fixed then emf will be induced. This principle is called

 static induced emf.
 dynamically induced emf.
 both A and B.
None of these

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

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