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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
MUF is highest in periods of greatest sunspot activity.

True
False

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Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With a reflector and one or more directors
With one or more directors
With a reflector
Only

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Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

Yes
No

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Electromagnetic Field Theory
In above problem the induced emf will be reduced to half if the conductor moves an angle of

  30° to the direction of field.
  60° to the direction of field.
  45° to the direction of field.
  75° to the direction of field.

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Electromagnetic Field Theory
Cork Screw rule is used to find

 direction of magnetic field.
 direction of emf.
 direction of current.
 direction of electric field.

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MORE MCQ ON Electromagnetic Field Theory

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