A proton and a deutron ( q=+ e, m=2.0 u ) having same kinetic energies enter a region of uniform magnetic field B, moving perpendicular to B. The…

A proton and a deutron ( $\displaystyle q=+\mathrm{e}, m=2.0 \mathrm{u}$ ) having same kinetic energies enter a region of uniform magnetic field $\displaystyle \vec{B}$, moving perpendicular to $\displaystyle \vec{B}$. The ratio of the radius $\displaystyle r_d$ of deutron path to the radius $\displaystyle r_p$ of the proton path is: