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The potential energy between two atoms in a molecule is given by 6 12 ) ( x b x a x U   ; where a and b are positive constants and x is the distance between the atoms. The atom is in stable equilibrium when

1. 6 5 11 b a x 
2. 6 2 b a x 
3. 0  x
4. 6 2 b a x 

Correct answer: 6 2 b a x 

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