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Question

- Force acting on the dipole is zero
- Force acting on the dipole is approximately PQ4πε0r3 and is acting upward
- Torque acting on the dipole is PQ4πε0r2 in clockwise direction
- Torque acting on the dipole is PQ4πε0r2 in anti-clockwise direction

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Solution

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By Newton's third law, every action has an equal and opposite reaction. Therefore the force on dipole due to Q is kQp/r3 upwards.

Also,

torque =→p×→E=p^j×kQ/r2^i=−kpQ/r2^k

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