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

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

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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

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

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