Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Front to back ratio
Loss coefficient
None of these
Transmission efficiency

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

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Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 both of sphere will have same potential.
 larger sphere will have smalled potential.
 larger sphere will have greater potential.
 smaller sphere will have zero potential.

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