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.
 QR.
  QD.
 Q√(R2 + d2).

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Electromagnetic Field Theory
The wave in wave guide has

Larger wavelength than in the free space
Larger frequency than in the free space
Group velocity inversely proportional to wavelength
Diminishing wavelength than in the free space

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