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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
An infinite non conducting sheet of charge has σ of 10-7 c/m3. Equipotential surface for a potential of 10 volts is.

 0.88 mm.
 1.32 mm.
  1.77 mm.
 0.

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

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

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

False
True

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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

 0.4 π V.
 0.8 π V.
 Zero.
 8 π V.

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

Both A and B
None of these
Unity
Constant

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