Proton, deuteron and alpha particle of same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, denuteron and alpha particle are respectively ${r_p},{r_d}$ and ${r_\alpha }$. Which one of the following relation is correct?
${r_\alpha } = {r_p} = {r_d}$
${r_\alpha } = {r_p} < {r_d}$
${r_\alpha } > {r_d} > {r_p}$
${r_\alpha } = {r_d} > {r_p}$
Solution
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