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Q. Dipole-dipole interaction energy between stationary polar molecules is proportional to $x$ and that between rotating molecules is proportional to $y$. Assume distance between polar molecules as $r$, then $x$ and $y$ are

States of Matter

Solution:

Dipole-dipole interaction energy between stationary polar molecule $\propto \frac{1}{r^3}$ and between rotating molecules $\propto \frac{1}{r^6}$