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

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

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 increases because of stray capacitance as the frequency increases.
 decreases because of stray capacitance as the frequency increases.
 remains same irrespective of the frequency.
 none of these.

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Electromagnetic Field Theory
In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include

Antenna replacement and feed correction
Polarization shifting and code diversity
Path diversity and frequency diversity
Amplitude timing and phase correction

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