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Electromagnetic Field Theory

Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Saturation magnetism.
 Coercivity.
 Retentivity.
 Hysteresis.

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

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

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Electromagnetic Field Theory
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

 6.25m.
 0.6m.
 0.5m.
 5.25m.

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Electromagnetic Field Theory
Between a hollow and solid metal sphere, charge reside

 on outer surface in both.
 on outer surface in hollow and throughout in solid
 on outer surface in hollow and throughout in solid.
 None of above.

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Electromagnetic Field Theory
A magnetic material has a total flux B of 80 micro Wb with an mmf of 160 AT. The reluctance in ampere turn per weber is

 2 × 108.
 2 × 106.
 2 × 10-6.
 2 × 10-8.

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Electromagnetic Field Theory
Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, I = 2 A.

 1000.
 None of these.
 100.
 500.

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MORE MCQ ON Electromagnetic Field Theory

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