Electromagnetic Field Theory
A point charge in space is attracted towards a dielectric material because of the

 dielectric hysteresis.
 maximisation of electrostatic flux.
 all of above.
 phenomenon of dielectric polarisation.

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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

Waveguides can handle large power at UHF and microwaves
At waveguide can be coupled to a coaxial cable
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
At frequencies below the cut off value the wave progresses across the waveguide after total reflections

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Electromagnetic Field Theory
A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be

 parallel to the plane of the wire.
 perpendicular to the circumference of the wire.
 none of above.
 parallel to half portion and perpendicular for the other half.

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