An electron, a proton, a deuteron and an alpha particle, each having the same speed are in a region of constant magnetic field perpendicular to the direction of the velocities of the particles. The radius of the circular orbits of these particles are respectively $R_e, R_p, R_d \,$ and $\, R_\alpha$. It follows that
  • A${R_e} = {R_p}$
  • B${R_p} = {R_d}$
  • C${R_d} = {R_\alpha }$
  • D${R_p} = {R_\alpha }$
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