An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius $r$. The Coulomb force $\vec{F}$ between the two is
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius $r$. The Coulomb force $\vec{F}$ between the two is
- A
$k\,\,\frac{{{e^2}}}{{{r^2}}}\,\,\hat r$
- B
$ - k\,\,\frac{{{e^2}}}{{{r^3}}}\,\,\hat r$
- C
$k\,\,\frac{{{e^2}}}{{{r^3}}}\,\,\hat r$
- D
$ - k\,\,\frac{{{e^2}}}{{{r^3}}}\,_r^ \to $
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- [AIPMT 2009]