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If the potential energy between two mole...

If the potential energy between two molecules is given by `U= -(A)/(r^6) + B/(r^(12))` , then at equilibrium , separation between molecules , and the potential energy are :

A

`A^2/(4B)`

B

`B^2/(4A)`

C

`(2B)/A`

D

`B^2/(4A)`

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