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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)
Options:
A .  Â QR2/d.
B .  Â Q√(R2 + d2).
C .  Â QR.
D .  Â  QD.
Answer: Option D

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