Ionized hydrogen atoms and α-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths r_H : r_α will be :

1. 2 : 1

2. 1 : 2

3. 4 : 1

4. 1 : 4

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. 2 : 1

In a magnetic field a charged particle moves in a circle of radius \(r=\dfrac{p}{qB}\).

Momentum \(p\) and \(B\) are the same, so \(r\propto \dfrac1q\).

Ionised hydrogen has charge \(+e\) and an \(\alpha\)-particle has \(+2e\).

\(r_H:r_\alpha=2e:e=2:1\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?