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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

6 db
4.15 db
3 db
2.15 db

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Electromagnetic Field Theory
A magnetic vector potential is given by the expression A = (- cos x) (cos y) uz. The flux density at the origin is

  0.
 – uy.
 2 ux.
 – 2 ux.

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Electromagnetic Field Theory
Materials subjected to rapid reversals of magnetism should have

 low permeability.
 high permeability.
 low hysteresis loss.
 both a and b.

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Electromagnetic Field Theory
The electrical field strength at a distance point A due to a point charge +q, located at the origin, is 100 µl v/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at origin, A, outside the sphere, becomes

 - 100 μ v/m.
 100 μ v/m.
 None of above.
 0.

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Electromagnetic Field Theory
If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then

 n × k = 0.
 n. k = 0.
 n = - k.
 n = K.

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Electromagnetic Field Theory
In case of all flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

 Zero.
 0.5.
 2.0.
 1.0.

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MORE MCQ ON Electromagnetic Field Theory

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