Electromagnetic Field Theory
Mutual inductance between two magnetically coupled coils depends on

 permeability of core.
 all of above.
 cross sectional area of their common core.
 the number of their turns.

ANSWER DOWNLOAD EXAMIANS APP

Electromagnetic Field Theory
A rectangular waveguide is a

Tube antenna to transmit and receive electromagnetic waves
Hollow rectangular walled room carrying electromagnetic wave
Rectangular conducting wire to propagate electromagnetic waves
Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed

ANSWER DOWNLOAD EXAMIANS APP

Electromagnetic Field Theory
Gradient of scalar field is expressed as

 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.
 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Maximum rate of increase of scalar function at a point.

ANSWER DOWNLOAD EXAMIANS APP