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

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 none of these.
 remains same irrespective of the frequency.
 decreases because of stray capacitance as the frequency increases.
 increases because of stray capacitance as the frequency increases.

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