Q. Proton and $\alpha -$particle are projected perpendicularly in a magnetic field, if both move in a circular path with same speed. Then ratio of their radii is
A) 1 : 2
B) 2 : 1
C) 1 : 4
D) 1 : 1
Explanation
(a) $\frac{r_{p}}{r_{\alpha}} = \frac{m_{p}}{m_{\alpha}} \times \frac{q_{\alpha}}{q_{p}}$
$= \frac{1}{4} \times \frac{2}{1} = \frac{1}{2}.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.