Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 37.68 mH.
 113.04 mH.
 37.68 µH.
 113.04 µH.

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

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