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

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Electromagnetic Field Theory
If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then

 the net force and torque on the coil are both zero.
 the net force and torque are both finite.
 the net force is zero but torque is finite.
 the net force is finite but torque is zero.

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