Are robin boundary conditions ever used in electrostatics? I can find three references on the internet that say they are:
"Modified Neumann boundary condition (also called Robin boundary condition – conditions where boundaries are specified as conductors with known charges)"
However, I don't understand this and I haven't been able to find any other more in depth explanations. It seems like these are references to the problem of a floating conductor or ground:
but that does not actually involve a Robin boundary (I don't think). Am I missing something or are these sources wrong?