A proton , a deuteron, and an alpha particle, accelerated
through the same potential difference, enter a region of uniform
magnetic field , moving at right angles to mag. field B.

(a) Find their kinetic energies. If the radius of proton’s
circular path is r_p, what are the radii of

(b) the deuteron and

(c) the alpha particle path in term of r_p

Please explain your steps or reasoning Thanks.