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Electromagnetic Field Theory

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

 50 W.
  25 W.
 20 W.
 15 W.

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 2.5 N.
 5 N.
 2 N.
 3.75 N.

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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

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

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Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 it has no sink or sources.
 magnetic flux lines are always closed.
 it is conservative.
 it is solenoidal.

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Electromagnetic Field Theory
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called

Scattering
Dispersion
Absorption
Polarisation

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

 Lenz
 Faraday
 Maxwell
 Fleming

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