Electromagnetic Field Theory
It was suggested by _____________ that the electric field should be imagined to be divided into tubes of force containing a fixed number of line of force

 all of above.
 Newton.
 Kelvin.
 Faraday.

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

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