Electromagnetic Field Theory
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

 none of these.
 10π coulombs.
 40π coulombs.
 80π coulombs.

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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

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

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