Electromagnetic Field Theory
The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as

 capacitance.
 self inductance.
 series aiding inductance.
 mutual inductance.

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

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