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

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

ANSWER DOWNLOAD EXAMIANS APP

Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 both of sphere will have same potential.
 larger sphere will have smalled potential.
 larger sphere will have greater potential.
 smaller sphere will have zero potential.

ANSWER DOWNLOAD EXAMIANS APP