A proton and a deuteron

A proton and a deuteron, each moving with velocity v enter simultaneously in the region of magnetic field B acting normal to the direction of velocity. Trace their trajectories establishing the relationship between the two.

Mass of proton = 1 u, mass of deuteron = 2 u Charge of proton = e, charge of deuteron = e Since charge is same for both particles, so

Trajectories of path is circular as given below :