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Electromagnetic Field Theory

Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 24t.
 4t3.
 12t3.
 12t.

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

 Electric fields.
  Electric current.
 Copper conductors.
 Commutator.

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Electromagnetic Field Theory
Which of the following will increase the antenna radiation efficiency?

Top loading of antenna
Providing insulation on conductor
Use of larger section of conductor
Any of the above

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Electromagnetic Field Theory
As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the

 normal velocity.
 phase velocity.
 velocity of propagation.
 group velocity.

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Electromagnetic Field Theory
A point charge in space is attracted towards a dielectric material because of the

 phenomenon of dielectric polarisation.
 all of above.
 maximisation of electrostatic flux.
 dielectric hysteresis.

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Electromagnetic Field Theory
In frec space E (z,t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z,t)

 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(-uy) A/m.
  (103/377) sin(ωt - β z)(-ux) A/m.
 None of above.

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MORE MCQ ON Electromagnetic Field Theory

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