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, A and B are positive constants. The equilibrium distance between the two atoms will be:

1
\(\left(\frac{A}{B}\right)^{\frac{1}{5}}\)
2
\(\left(\frac{B}{A}\right)^{\frac{1}{5}}\)
3
\(\left(\frac{2 A}{B}\right)^{\frac{1}{5}}\)
4
\(\left(\frac{B}{2 A}\right)^{\frac{1}{5}}\)
5
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