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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.
 24t.
 12t.

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Electromagnetic Field Theory
A magnetic material has a total flux B of 80 micro Wb with an mmf of 160 AT. The reluctance in ampere turn per weber is

 2 × 10-8.
 2 × 106.
 2 × 108.
 2 × 10-6.

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Wave frequency
Distance of the point from the antenna
Antenna height
Current of the antenna

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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

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

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Electromagnetic Field Theory
Which of the following represents ohms law

 J = σE
 I = GV
 V = RI
All of these

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Electromagnetic Field Theory
Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, I = 2 A.

 100.
 1000.
 500.
 None of these.

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