Answer:
At any axial point of a dipole, electric field varies as \[E\propto \frac{1}{{{r}^{3}}}\]or \[\frac{F}{q}=\frac{1}{{{r}^{3}}}\]or \[F\propto \frac{1}{{{r}^{3}}}\] \[\therefore \] When the distance of the point charge is doubled, the force reduces to \[F/8\].
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