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Electromagnetic Field Theory

Electromagnetic Field Theory
The attenuation in waveguide above to cut off frequency

Very low
Infinite
Zero
Very high

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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.

 0.6m.
 6.25m.
 0.5m.
 5.25m.

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Electromagnetic Field Theory
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is

 2 A/m.
 1 A/m.
 4 A/m.
 8 A/m.

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Electromagnetic Field Theory
The right hand rule for determining the direction of the induced EMF was introduced by

 Faraday
 Lenz
 Maxwell
 Fleming

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

 15 W.
 50 W.
  25 W.
 20 W.

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Electromagnetic Field Theory
The operation of electric generators and motors depend on the intraction between magnetic field and

  Electric current.
 Electric fields.
 Commutator.
 Copper conductors.

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MORE MCQ ON Electromagnetic Field Theory

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