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

B

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

C

x=0

D

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

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