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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

 12t3.
 12t.
 4t3.
 24t.

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Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = 2b
a = b/4
a = b
a = 3b

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Electromagnetic Field Theory
Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

 will move out of the field of influence of two charges.
 remain in stable equilibrium.
 not be equilibrium.
 be in unstable equilibrium.

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Electromagnetic Field Theory
The magnitude of the induced emf in a conductor depends upon on the

 amount of flux cut.
 rate of change of flux linkage.
 amount of flux linkage.
 flux density of the magnetic field.

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Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Grad div A.
 Curl curl A.
 Div grad V.
 Div curl A.

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Electromagnetic Field Theory
In order to minimize loss due to hysteresis the magnetic material should have

 large coercivity.
 small B-H loop area.
 high resistivity.
 high hysteresis coefficient.

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MORE MCQ ON Electromagnetic Field Theory

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