$(a)\;\large\frac{1}{2}\;\large\frac{e^{2}}{r}\qquad(b)\;-\large\frac{e^{2}}{r}\qquad(c)\;\large\frac{me^{2}}{r}\qquad(d)\;-\large\frac{1}{2}\large\frac{e^{2}}{r}$

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