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Electromagnetic Field Theory

Electromagnetic Field Theory
In an inductor current cannot change abruptly. Comment on the statement.

 True.
 True partially.
 Cannot comment.
 False.

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Electromagnetic Field Theory
The magnetic vector potential due to a single conductor carrying current is

 none of tha above.
 finite.
 zero.
 infinite.

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Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 None of these.
 Ex = Ey = 0, By = Bz = 0.
 Ey = Ez = 0, By = Bz = 0.
 Ex = Ey = 0, Bx = By = 0.

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Electromagnetic Field Theory
What is the value of total electric flux coming out of a closed surface?

 Equal to total charge enclosed by the surface.
 Zero.
 Equal to the surface charge density.
 Equal to volume change density.

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 open circuit.
 depends on polarity.
 depends on magnitude of voltage.
 short circuit.

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

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