Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.01.
 0.577.
 0.447.
 0.477.

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

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

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