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

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

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Electromagnetic Field Theory
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

 directly proportional to the square of the distance between them.
 inversely proportional to the distance between them.
 inversely proportional to the square of the distance between them.
 directly proportional to the distance between them.

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