Two point dipoles of dipole moment ${\vec P_1}$ and ${\vec P_2}$ are at a distance $x$ from each other and ${\vec P_1}$ || ${\vec P_2}$. The force between the dipoles is
JEE MAIN 2013, Medium
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Force if interaction
$F = \frac{1}{{4\pi {\varepsilon _0}}}.\frac{{3{p_1}{p_2}}}{{{r^4}}}$
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