Potential energy as a function of r is given by $U = {A \over {{r^{10}}}} - {B \over {{r^5}}}$, where r is the interatomic distance, A and B are positive constants. The equilibrium distance between the two atoms will be :

Question

${\left( {{A \over B}} \right)^{{1 \over 5}}}$

${\left( {{B \over A}} \right)^{{1 \over 5}}}$

${\left( {{2A \over B}} \right)^{{1 \over 5}}}$

${\left( {{B \over 2A}} \right)^{{1 \over 5}}}$

Solution

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