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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 constants and x is the distance between the atoms. The atom is in 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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The correct Answer is:
A
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