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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

 10T.
 0.5T.
 5T.
 2.5T.

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Electromagnetic Field Theory
Which antenna is a wideband antenna?

None of these
Folded dipole
Hertz antenna
Marconi antenna

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Distance of the point from the antenna
Wave frequency
Current of the antenna
Antenna height

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Electromagnetic Field Theory
What is the value of magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it?

 Unity.
 Infinity.
 Zero.
 Depends on strength of current element.

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Electromagnetic Field Theory
XEROX machine is working on

 magnetic effect.
 heating effect of current.
 peltier effect.
 electrostatic effect.

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MORE MCQ ON Electromagnetic Field Theory

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