Electromagnetic Field Theory
A rectangular waveguide is a

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

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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.
 Maximum rate of increase of scalar function at a point.
 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.

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Electromagnetic Field Theory
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

 directly proportional to the square of the distance between them.
 directly proportional to the distance between them.
 inversely proportional to the distance between them.
 inversely proportional to the square of the distance between them.

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