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
Path diversity and frequency diversity
Polarization shifting and code diversity
Amplitude timing and phase correction

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Electromagnetic Field Theory
If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then

 the net force and torque are both finite.
 the net force is finite but torque is zero.
 the net force is zero but torque is finite.
 the net force and torque on the coil are both zero.

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