Electromagnetic Field Theory
A rectangular waveguide is a

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

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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

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

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