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

Force on dipole is $\vec{F} = \vec{p} (\frac{d \vec{E}}{d r})$ , as the electric field is nearly constant in that small region.

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