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If the potential energy of a gas molecul...

If the potential energy of a gas molecule is `U=(M)/(r^(6))-(N)/(r^(12)),M ` and `N` being positive constants, then the potential energy at equilibrium must be

A

zero

B

`M^(2)//4N`

C

N^(2)//4M`

D

`MN^(2)//4`

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