Electromagnetic Field Theory
The field at any point on the axis of a current carrying coil will be

 parallel to axis.
 perpendicular to the axis.
 zero.
 at angle of 45° with the axis.

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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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