Electromagnetic Field Theory
In a perfect conductor the incident and reflected wave combine to produce

A standing wave which is not progressing
A stronger reflected wave
A stronger incident wave
None of these

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Electromagnetic Field Theory
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

 directly proportional to the square of the distance between them.
 directly proportional to the distance between them.
 inversely proportional to the distance between them.
 inversely proportional to the square of the distance between them.

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Electromagnetic Field Theory
A rectangular waveguide is a

Rectangular conducting wire to propagate electromagnetic waves
Hollow rectangular walled room carrying electromagnetic wave
Tube antenna to transmit and receive electromagnetic waves
Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed

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