An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force $\overrightarrow F $ between the two is

Question

$K{{{e^2}} \over {{r^2}}}\widehat r$

$ - K{{{e^2}} \over {{r^3}}}\widehat r$

$K{{{e^2}} \over {{r^3}}}\widehat r$

$ - K{{{e^2}} \over {{r^2}}}\widehat r$

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