Electromagnetic Field Theory
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

 Q/(4 π εo r3).
 QR/(4π εo r3).
 Qr/(4 π εo R3).
 3 Qr/(4 π εo R3).

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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
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exits between the conductor and the ground. The maximum electric stress occur at

 The ground surface.
 The upper surface of the conductor.
 The lower surface of the conductor.
 Midway between the conductor and ground.

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