If the potential energy of a gas molecule is $U = \frac{M}{{{r^6}}} - \frac{N}{{{r^{12}}}},M$ and $N$ being positive constants, then the potential energy at equilibrium must be

  • A

    zero

  • B

    $\frac {M^2}{4N}$

  • C

    $\frac {N^2}{4M}$

  • D

    $\frac {MN^2}{4}$

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