Electromagnetic Field Theory
The wave in wave guide has

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

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

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