Electromagnetic Field Theory
Which of the following statement is correct for divergence of electric and magnetic flux densities?

 It is zero for the electric flux density.
 Both are zero.
 These are zero for static densities but non zero for time varying densities.
 It is zero for the magnetic flux density.

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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

 less than that of disc but in opposite direction.
 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.

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