Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

  10 mH.
 0 mH.
 20 mH.
 5 mH.

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Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field is a non zero constant.
 electric field changes with distance from the center of the sphere.
 electric field is zero.
 electric field changes with magnitude of the charge given to the conductor.

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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

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

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