Electromagnetic Field Theory
Gradient of scalar field is expressed as

 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.
 Circulation of a vector field per unit area as the area tends to zero.
 Maximum rate of increase of scalar function at a point.

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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 midway between the conductor and ground.
 upper surface of the conductor.
 lower surface of the conductor.
 the ground surface.

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Electromagnetic Field Theory
The wave in wave guide has

Diminishing wavelength than in the free space
Group velocity inversely proportional to wavelength
Larger wavelength than in the free space
Larger frequency than in the free space

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