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Electromagnetic Field Theory

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

 True partially.
 Cannot comment.
 True.
 False.

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Electromagnetic Field Theory
Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

 10T.
 0.5T.
 5T.
 2.5T.

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Electromagnetic Field Theory
Parabolic and lens antenna used at

High frequency
Low frequency
Medium frequency
Microwave frequency

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

 20 mH.
 5 mH.
  10 mH.
 0 mH.

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Electromagnetic Field Theory
If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, then

 n = K.
 n × k = 0.
 n = - k.
 n. k = 0.

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Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With one or more directors
Only
With a reflector
With a reflector and one or more directors

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