The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)
(a) $\frac{{\mathrm{e}}^{2}}{{\mathrm{r}}^{2}}$                (b) $\frac{{\mathrm{e}}^{2}}{2\mathrm{r}}$
(c) $\frac{{\mathrm{e}}^{2}}{\mathrm{r}}$                (d) $\frac{{\mathrm{e}}^{2}}{2\mathrm{r}}$

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