I have this function (to calculate potential for classical over-barrier model if you're wondering) where qp and qt are both (different) particle charges:(adsbygoogle = window.adsbygoogle || []).push({});

V(a,R) = -(qp /R) - [qt / (R-a)]

What is dV/da?

The maximum of the function occurs when dV/da = 0, and I need to solve for a. So does solving for a yield R[1 + sqrt(qt/qp)]^-1?

Thanks

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# Derivative particle problem

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