Electrostatics

Question: 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 (Where \[K = \frac{1}{{4\pi {\varepsilon _0}}}\])

1) \[ - K\frac{{{e^2}}}{{{r^3}}}\hat r\]

2) \[K\frac{{{e^2}}}{{{r^3}}}\vec r\]

3) \[ - K\frac{{{e^2}}}{{{r^3}}}\vec r\]

4) \[K\frac{{{e^2}}}{{{r^2}}}\hat r\]

Solution:

Explanation: 3e

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