Electromagnetic Field Theory
Which of the following statement is correct for divergence of electric and magnetic flux densities?

 It is zero for the electric flux density.
 It is zero for the magnetic flux density.
 These are zero for static densities but non zero for time varying densities.
 Both are zero.

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Electromagnetic Field Theory
A rectangular waveguide is a

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

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