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)

  QD.
 QR.
 QR2/d.
 Q√(R2 + d2).

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Electromagnetic Field Theory
Gradient of scalar field is expressed as

 Maximum rate of increase of scalar function at a point.
 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Gradient of divergence of a vector field minus the curl of the vector field.
 Circulation of a vector field per unit area as the area tends to zero.

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