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

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

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP