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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = J.
 Divergence of B = J.
 Curl of B = 0.
  Divergence of B = 0.

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 none of these.
 it is a perfect transformer.
 turns ratio of the transformer is also two.
 transformer is an ideal transformer.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Front to back ratio
Loss coefficient
None of these
Transmission efficiency

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Electromagnetic Field Theory
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

 none of these.
 40π coulombs.
 80π coulombs.
 10π coulombs.

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Electromagnetic Field Theory
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is

 4 A/m.
 1 A/m.
 2 A/m.
 8 A/m.

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Electromagnetic Field Theory
If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then

 n × k = 0.
 n. k = 0.
 n = - k.
 n = K.

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