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An electric dipole is kept on the axis of a uniformly charged ring at distance $\sqrt{2} R$ from the center 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 torque on the dipole is

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zero

$\frac{pQ}{3 {πε}_{0} R^{2}}$

$\frac{4 pQ}{3 {πε}_{0} \sqrt{3} R^{2}}$

$\frac{pQ}{3 {πε}_{0} \sqrt{3} R^{2}}$

answer is D.

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Detailed Solution

As the dipole moment is along the axis of ring the angle between dipole moment and electric field will be zero. Hence torque will also be zero.

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