If $m$ and $e$ are the mass and charge of the revolving electron in the orbit of radius $r$ for a hydrogen atom,the total energy of the revolving electron will be:
- A$\frac{1}{2} \frac{e^2}{r}$
- B$-\frac{e^2}{r}$
- C$\frac{m e^2}{r}$
- D$-\frac{1}{2} \frac{e^2}{r}$
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