According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
(a)$+\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and  $-\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$            (b) $+\frac{8{\mathrm{\pi \epsilon }}_{0}{\mathrm{e}}^{2}}{\mathrm{r}}$ and $-\frac{4{\mathrm{\pi \epsilon }}_{0}{\mathrm{e}}^{2}}{\mathrm{r}}$
(c) $-\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and $-\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$            (d) $+\frac{{\mathrm{e}}^{2}}{8{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$ and $+\frac{{\mathrm{e}}^{2}}{4{\mathrm{\pi \epsilon }}_{0}\mathrm{r}}$

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