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Electromagnetic Field Theory

Electromagnetic Field Theory
Two straight parallel conductors carry equal currents in opposite direction. The force between them is

 attractive.
 none of above.
 zero.
 repulsive.

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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

 50 W.
  25 W.
 20 W.
 15 W.

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

Phase shifter
None
An isolator
An attenuator

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Electromagnetic Field Theory
It is best to use for coupling a coaxial line to a parallel wire transmission line.

Slotted line
Directional Coupler
Tee
Balun

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Electromagnetic Field Theory
A sphere of 20 cm radius contains electrical charge of density 2/(r sinθ) c/m3. What is the total charge contained within the sphere?

 0.335/sinθ c.
 0.335 C.
 None of above.
 0.

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Electromagnetic Field Theory
In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will

 remain the same.
 initially increase and then decrease.
 increase.
 decrease.

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MORE MCQ ON Electromagnetic Field Theory

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