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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2003
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Q)

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 - <br> (where $K = \frac{1}{4 \pi \varepsilon_0}$ )


( A ) $-K \frac{e^2}{r^3} \hat{r}$
( B ) $K \frac{e^2}{r^3} \overrightarrow{r}$
( C ) $-K \frac{e^2}{r^3} \overrightarrow{r}$
( D ) $K \frac{e^2}{r^2} \hat{r}$

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