Question

An $\alpha$-particle (mass $4 \,amu$ ) and a singly charged sulfur ion (mass $32\, amu$ ) are initially at rest. They are accelerated through a potential $V$ and then allowed to pass into a region of uniform magnetic field which is normal to the velocities of the particles. Within this region, the $\alpha$-particle and the sulfur ion move in circular orbits of radii $r_{\alpha}$ and $r_{s}$, respectively. The ratio $\left(\frac{r_{s} }{ r_{a}}\right)$ is _____

Answer 1

Answer: 4