Q. 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 $r_H : r_\alpha$ will be
A) 2 : 1
B) 1 : 2
C) 4 : 1
D) 1 : 4
Explanation
[Solution] $r = \frac{p}{qB}$; with equal p, $r \propto 1/q$, so $r_H : r_\alpha = 2e : e = 2 : 1$. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.