Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ex = Ey = 0, Bx = By = 0.
 None of these.
 Ex = Ey = 0, By = Bz = 0.
 Ey = Ez = 0, By = Bz = 0.

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

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Electromagnetic Field Theory
The effective reactance of an inductive coil

 remains same irrespective of the frequency.
 increases because of stray capacitance as the frequency increases.
 decreases because of stray capacitance as the frequency increases.
 none of these.

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