Q. A proton, a deutron and an $\alpha -$ particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If $r_{p},\ r_{d}$ and $r_{\alpha}$ denote respectively the radii of the trajectories of these particles, then
A) $r_{\alpha} = r_{d} > r_{p}$
B) $r_{\alpha} = r_{d} = r_{p}$
C) $r_{\alpha} < r_{d} < r_{p}$
D) $r_{\alpha} = r_{p} < r_{d}$
Explanation
The correct answer is Option A: $r_{\alpha} = r_{d} > r_{p}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.