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Electromagnetic Field Theory

Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 lines of force.
 tubes of indication.
 magnetic flux.
 none of them.

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Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 250.
 145.
 225.
 150.

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Electromagnetic Field Theory
Parabolic and lens antenna used at

Medium frequency
High frequency
Microwave frequency
Low frequency

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Electromagnetic Field Theory
The main purpose of choke is

 none of above.
 to pass high frequencies.
  to pass low frequencies.
 to block low frequencies.

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Electromagnetic Field Theory
Which of the following represents ohms law

 J = σE
All of these
 I = GV
 V = RI

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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.
 None of these.
 500.
 1000.

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