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

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Electromagnetic Field Theory
Gradient of scalar field is expressed as

 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Circulation of a vector field per unit area as the area tends to zero.
 Gradient of divergence of a vector field minus the curl of the vector field.
 Maximum rate of increase of scalar function at a point.

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