Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 37.68 µH.
 113.04 mH.
 37.68 mH.
 113.04 µH.

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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.
 Maximum rate of increase of scalar function at a point.
 Gradient of divergence of a vector field minus the curl of the vector field.

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Electromagnetic Field Theory
A rectangular waveguide is a

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

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