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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Electromagnetic Field Theory
Gradient of scalar field is expressed as

 Gradient of divergence of a vector field minus the curl of the vector field.
 Circulation of a vector field per unit area as the area tends to zero.
 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Maximum rate of increase of scalar function at a point.

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Electromagnetic Field Theory
Inside a hollow conducting sphere

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

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