Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(H + V × E).
 q(E + V × B).
 q(E +V × H).
 q(E + B × V).

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

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