Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 the ground surface.
 midway between the conductor and ground.
 upper surface of the conductor.
 lower surface of the conductor.

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

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