College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 28

A proton (charge + e , mass m p ), a deuteron (charge + e , mass 2 m p ), and an alpha particle (charge +2 e , mass 4 m p ) are accelerated from rest through a common potential difference V. Each of the particles enters a uniform magnetic field , with its velocity in a direction perpendicular to . The proton moves in a circular path of radius r p. In terms of r p , determine (a) the radius r d of the circular orbit for the deuteron and (b) the radius r for the alpha particle.