Electromagnetic Field Theory
The effective reactance of an inductive coil

 none of these.
 remains same irrespective of the frequency.
 increases because of stray capacitance as the frequency increases.
 decreases because of stray capacitance as the frequency increases.

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

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