Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 150.
 225.
 145.
 250.

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

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

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

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