A proton (charge +e, mass mp), a deuteron (charge +e, mass 2m), and an alpha particle (charge +2e, mass 4m) are accelerated from rest through a common potential difference AV. Each of the particles enters a uniform magnetic field B, with its velocity in a direction perpendicular to B. The proton moves in a circular path of radius p (a) In terms of rp, determine the radius of the circular orbit for the deuteron. 1.414 (b) In terms of rp, determine the radius r for the alpha particle. 1.414 x