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The KE of the electron in an orbit of radius r in hydrogen atom is : (e = electronic charge)

A. $\frac{e^{2}}{r^{2}}$

B. $\frac{e^{2}}{2 r}$

C. $\frac{e^{2}}{r}$

D. $\frac{e^{2}}{2 r^{2}}$

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Correct Answer : B.

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