Potential energy as a function of $r$ is given by $U = \frac{A}{r^{10}} - \frac{B}{r^{5}}$,where $r$ is the interatomic distance,and $A$ and $B$ are positive constants. The equilibrium distance between the two atoms will be
- A$\left(\frac{A}{B}\right)^{\frac{1}{5}}$
- B$\left(\frac{B}{A}\right)^{\frac{1}{5}}$
- C$\left(\frac{2A}{B}\right)^{\frac{1}{5}}$
- D$\left(\frac{B}{2A}\right)^{\frac{1}{5}}$
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