Electromagnetic Field Theory
Mutual inductance between two magnetically coupled coils depends on

 cross sectional area of their common core.
 the number of their turns.
 permeability of core.
 all of above.

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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
Path diversity and frequency diversity
Amplitude timing and phase correction
Antenna replacement and feed correction

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