Question

An electron is moving round the nucleus of a hydrogen atom in a circuit orbit of radius r. The Coulomb force $\overrightarrow{F}$ on the electron is :-

• A. $K\frac{e^2}{r^2}\stackrel{\wedge }{r}$
• B. $-K\frac{e^2}{r^3}\stackrel{\wedge }{r}$
• C. $K\frac{e^2}{r^3}\overrightarrow{r}$
• D. $-K\frac{e^2}{r^3}\overrightarrow{r}$

Answer 1

The correct option is D $-K\frac{e^2}{r^3}\overrightarrow{r}$