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

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
At waveguide can be coupled to a coaxial cable
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves

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Electromagnetic Field Theory
The statement which is not correct from the following:

 Gauss’s law states that total electric flux through any surface is equal to the total charge enclosed by surface.
 An electric flux line is an imaginary path or a line drawn in such a way, that its direction at any point is the direction of electric field at that point.
 For a uniform long charged line with l1 c/m the electric field intensity E is given as E = ρL/(π ε0.r).
 Gauss’s static that divergence of D = ρu.

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