Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is

 0.015 joule.
 0.15 joule.
 1.15 joule.
 0.015 joule.

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Electromagnetic Field Theory
Gradient of scalar field is expressed as

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

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