The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules,respectively,is proportional to: [$r$ is the distance between the polar molecules]
- A$1 / r^3 ; 1 / r^6$
- B$1 / r^3 ; 1 / r^3$
- C$1 / r^2 ; 1 / r^6$
- D$1 / r^2 ; 1 / r^4$
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