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

 0.477.
 0.01.
 0.447.
 0.577.

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Electromagnetic Field Theory
According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when

The impedance of one of the networks is half that of the other
None of these
The impedance of one is equal to that of the other
The impedance of one is the complex conjugate of the other

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