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The potential energy between two atoms i...

The potential energy between two atoms in a molecule is given by, `U_((x))=(a)/x^(12)-(b)/x^(6)` , where a and b are positive constant and x is the distance between the atoms. The atoms is an stable equilibrium, when-

A

`x=0`

B

`x=((a)/(2b))^(1//6)`

C

`x=((2a)/(b))^(1//6)`

D

`x=((11a)/(5b))^(1//6)`

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