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Electromagnetic Field Theory

Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = 3b
a = b
a = 2b
a = b/4

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Electromagnetic Field Theory
In H-plane metal plate lens the travelling wave front is

Accelerated
Retarded
Totally retarded
Neither accelerated nor retarded

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Electromagnetic Field Theory
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

Yes
No

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Electromagnetic Field Theory
What is the value of magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it?

 Infinity.
 Depends on strength of current element.
 Unity.
 Zero.

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Electromagnetic Field Theory
XEROX machine is working on

 electrostatic effect.
 peltier effect.
 magnetic effect.
 heating effect of current.

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Electromagnetic Field Theory
Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

 450.
 600.
 300.
 150.

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MORE MCQ ON Electromagnetic Field Theory

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