An $\alpha $ particle and a proton travel with same velocity in a magnetic field perpendicular to the direction of their velocities, find the ratio of the radii of their circular path
AIIMS 2004, Medium
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(c) $r = \frac{{mv}}{{qB}} \Rightarrow \frac{{{r_\alpha }}}{{{r_p}}} = \frac{{{m_\alpha }}}{{{m_p}}} \times \frac{{{q_p}}}{{{q_\alpha }}} = \frac{4}{1} \times \frac{1}{2} = \frac{2}{1}$
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