Electromagnetic Field Theory
Biot-Savarts law states the relation between magnetic intensity and

 (A), (B), and (D) are all correct.
 filament current only.
 volume current only.
 surface current only.

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Electromagnetic Field Theory
A rectangular waveguide is a

Rectangular conducting wire to propagate electromagnetic waves
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

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