Electromagnetic Field Theory
A rectangular loop in the x – z plane bounded by the lines x = 0, x = a, z = 0 and z = b is in a time varying magnetic field is given by B = B0 cosωt + ay. Where B0 is constant, ω is angular frequency and ay unit vector in the y direction. Now the emf induced in the loop is given by

  abω Bo sinω t.
 Bo ω sinω t.
 ab Bo cosω t.
 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 co-energy at constant mmf.
 to decrease the stored energy at constant flux.
 to decrease the stored energy at constant mmf.
 to increase the stored energy at constant flux.

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