Two tiny electric dipoles of dipole moment $P_1$ and $P_2$ are placed $'r'$ distance coaxially find magnitude of electrostatic force between them.
Medium
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$F=P_{2} \frac{d}{d r}\left(\frac{2 K P_{1}}{r^{3}}\right)$
$\mathrm{F}=2 \mathrm{KP}_{1} \mathrm{P}_{2} \frac{\mathrm{d}}{\mathrm{dr}} \mathrm{r}^{-3}$
$\boxed{{\text{F}} = - 6\frac{{{\text{K}}{{\text{P}}_1}{{\text{P}}_2}}}{{{{\text{r}}^4}}}}$
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