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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

 4t3.
 12t3.
 12t.
 24t.

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Electromagnetic Field Theory
The work done by a force F = 4un - 3uy + 2uz N in giving a 1nC charge a displacement of (10 ux + 2uy - 7uz) m is

 100 nj.
 60 nj.
 40 nj.
 20 nj.

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Magnetic flux density.
None of these
 Electric flux.
 Electric intensity.

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Electromagnetic Field Theory
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

Refraction
None of these
Reflection
Transmission

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

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

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Electromagnetic Field Theory
Skin depth is proportional to

 1/√σ.
 Permeability.
 Frequency.
 √(σ).

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