A small electric dipole is kept on the axis of a uniformly charged ring at distance R/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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Detailed Solution

Force on dipole is F→=p→(dE→dr) , as the electric field is nearly constant in that small region.

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