Electromagnetic Field Theory
Which statement does not say that electrostatic field is conservative?

 If the curl of E is identically zero.
 The potential difference between two points is zero.
 If is gradient of a scalar potential.
 The work done in a closed path inside the fields is zero.

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

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