Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 113.04 mH.
 113.04 µH.
 37.68 µH.
 37.68 mH.

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Electromagnetic Field Theory
The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends

 to increase the stored energy at constant flux.
 to decrease the stored energy at constant mmf.
 to decrease the co-energy at constant mmf.
 to decrease the stored energy at constant flux.

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Electromagnetic Field Theory
The wave in wave guide has

Group velocity inversely proportional to wavelength
Larger wavelength than in the free space
Larger frequency than in the free space
Diminishing wavelength than in the free space

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