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Question

A short dipole of dipole moment P is placed near a point charge Q as shown in figure. Find force on the dipole due to the point charge

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Solution

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Force on the point charge due to the dipole
$$F = (Q)E_{dipole}$$

$$F = (Q) \left(\dfrac{2KP}{r^3}\right)$$ (towards right)

For action-reaction concept, force on the dipole due to point charge will be equal to the force on charge due to dipole.

Hence, force on dipole,

$$F' = \dfrac{2KPQ}{r^3}$$ (towards left)

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