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
  • A$\frac{1}{{4\pi {\varepsilon _0}}}\frac{{4{p_1}{p_2}}}{{{x^4}}}$
  • B$\frac{1}{{4\pi {\varepsilon _0}}}\frac{{3{p_1}{p_2}}}{{{x^3}}}$
  • C$\frac{1}{{4\pi {\varepsilon _0}}}\frac{{6{p_1}{p_2}}}{{{x^4}}}$
  • D$\frac{1}{{4\pi {\varepsilon _0}}}\frac{{8{p_1}{p_2}}}{{{x^4}}}$
JEE MAIN 2013, Medium
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