Dipole

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Question

A small electric dipole is kept on the axis of a uniformly charged ring at distance $R / \sqrt{2}$ from the centre of the ring. The direction of the dipole moment is along the axis. The dipole moment is P charge of the ring is Q and radius of the ring is R. The force on the dipole is nearly

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Solution

Let assume that length of dipole is negligible when compared with ‘x’.
Hence E at –q and +q would be approximately same. $F_{n e t} = 0$

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