Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

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

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Electromagnetic Field Theory
The wave in wave guide has

Group velocity inversely proportional to wavelength
Larger frequency than in the free space
Diminishing wavelength than in the free space
Larger wavelength than in the free space

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