$\begin{array}{1 1} (1)\; \frac{e}{\sqrt{4 \pi m \varepsilon_0 r}} \\ (2)\; \frac{2e}{\sqrt{\pi m \varepsilon_0 r}} \\ (3)\; \frac{e}{\sqrt{\pi m \varepsilon_0 r}} \\ (4)\; \frac{e}{4 \pi m \varepsilon_0 r} \end{array}$

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