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Physics · PYQ NEET UG 2019(1)
हिन्दीIonized hydrogen atoms and \( \alpha \)-particles with same momenta enter perpendicular to a constant magnetic field, B. The ratio of their radii of their paths \( r_H : r_\alpha \) will be:
Correct answer · Option 3
2 : 1
Explanation
Radius of charged particle in magnetic field is \( r = \frac{p}{qB} \). Since momentum \( p \) and \( B \) are same, \( r \propto \frac{1}{q} \). Thus, \( \frac{r_H}{r_\alpha} = \frac{q_\alpha}{q_H} = \frac{2e}{e} = \frac{2}{1} \).
