Electromagnetic Field Theory
Biot-Savarts law states the relation between magnetic intensity and

 surface current only.
 filament current only.
 volume current only.
 (A), (B), and (D) are all correct.

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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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