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The potential energy between the atoms in a molecule is given by  U(x)=ax12-bx6 where, a and b are positive constants and x is the distance between the atoms . The atom is in equilibrium when

a
x=0
b
x=a2b1/6
c
x=2ab1/6
d
x=11a5b1/6

detailed solution

Correct option is C

At equilibrium.  F=-dUdx=0⇒(-12)ax-13+6bx-7=0∴    x=2ab1/6

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