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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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The correct Answer is:
B
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