In a current carrying circular wire,
$\mathrm{B}\propto \mathrm{I}$

An electron is projected with velocity ${\mathrm{v}}_0$ in a uniform electric field $\mathrm{E}$ perpendicular to the field. Again it is projected with velocity ${\mathrm{v}}_0$ perpendicular to a uniform magnetic field $\mathrm{B}$. If $r_1$ is initial radius of curvature just after entering in the electric field and ${\mathrm{r}}_2$ is initial radius of curvature just after entering in magnetic field then the ratio ${\mathrm{r}}_1/{\mathrm{r}}_2$ is equal to :