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
Which statement does not say that electrostatic field is conservative?

 The potential difference between two points is zero.
 If the curl of E is identically zero.
 The work done in a closed path inside the fields is zero.
 If is gradient of a scalar potential.

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