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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = J.
 Divergence of B = J.
  Divergence of B = 0.
 Curl of B = 0.

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

 repulsive.
 attractive.
 none of above.
 zero.

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Electromagnetic Field Theory
Radiation intensity in a given direction is the

None of these
Power radiated per unit solid angle in that direction
Energy radiated per square metre
Power radiated per square metre

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

  10 mH.
 0 mH.
 5 mH.
 20 mH.

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Electromagnetic Field Theory
The lagging of flux density behind the applied magnetising force is known as

 permeance.
 flux.
 hysteresis.
All of these

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

Balun
Tee
Directional Coupler
Slotted line

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