Ionized hydrogen atoms and $\alpha$ -particles with same momenta enters perpendicular to a constant magnetic field $B$. The ratio of their radii of their paths $\mathrm{r}_{\mathrm{H}}: \mathrm{r}_{\alpha}$ will be
NEET 2019, Medium
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$\frac{\mathrm{q}_{\mathrm{H}}}{\mathrm{q}_{\mathrm{\alpha}}}=\frac{1}{2}$
$r=\frac{m v}{q B}$
For same momenta, $r \propto \frac{1}{q}$
$\frac{r_{H}}{r_{\alpha}}=\frac{q_{\alpha}}{q_{H}}=\frac{2}{1}$
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