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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 low permeability.
 both a and b.
 low hysteresis loss.
 high permeability.

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Electromagnetic Field Theory
The useful magnetic flux obtainable from any closed surface is

Unity
Constant
Both A and B
None of these

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Electromagnetic Field Theory
A circular loop has its radius increasing at a rate of 2 m/s. The loop placed perpendicular to a constant magnetic field of 0.5 wb/m2. When the radius of the loop is 4 m. the emf induced in the will be

 0.8 π V.
 Zero.
 0.4 π V.
 8 π V.

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Electromagnetic Field Theory
The radiation pattern of loop antenna is

Semicircle
Elliptical
Cardoid or Limacon
Circle

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Electromagnetic Field Theory
The field at any point on the axis of a current carrying coil will be

 perpendicular to the axis.
 parallel to axis.
 at angle of 45° with the axis.
 zero.

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MORE MCQ ON Electromagnetic Field Theory

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