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Electromagnetic Field Theory

Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

3 db
4.15 db
6 db
2.15 db

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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

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

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Electromagnetic Field Theory
Electric flux in coulombs emanating from any surface of a cube containing C coulombs of charge at its centre is

 Q / 6ε.
 4πQ / 6ε.
 Q / 4π.
 Q / 6.

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Electromagnetic Field Theory
In order to minimize loss due to hysteresis the magnetic material should have

 large coercivity.
 high hysteresis coefficient.
 small B-H loop area.
 high resistivity.

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Electromagnetic Field Theory
inductance (L2) in parallel without mutual coupling will be

 5 mH.
 15 mH.
 20 mH.
 10 mH.

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Electromagnetic Field Theory
An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

 64 A / s.
 4 A / s.
 16 A / s.
 32 A / s.

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MORE MCQ ON Electromagnetic Field Theory

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