Electromagnetic Field Theory
A circular ring is carrying uniformly distributed charge q and a point charge – Q on the axis of the ring. The magnitude of dipole moment of the charge system is (Assume distance between centre of ring and point charge is d and radius of ring R)

 QR2/d.
 Q√(R2 + d2).
 QR.
  QD.

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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
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 upper surface of the conductor.
 midway between the conductor and ground.
 the ground surface.
 lower surface of the conductor.

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