\(\frac{\mathrm{Kq}_1 \mathrm{q}_2}{\mathrm{r}^2}=\frac{\mathrm{mv}^2}{\mathrm{r}}\)
\(\mathrm{mv}^2 \mathrm{r}^2=\mathrm{K}_{\mathrm{q}_1 \mathrm{q}_2 \mathrm{r}}\)
\(\frac{\mathrm{L}^2}{\mathrm{~m}}=\mathrm{Kq}_1 \mathrm{q}_2 \mathrm{r}\)
\(\mathrm{L} \propto \sqrt{\mathrm{r}}\)