Question: Protons and deuterons (each with charge +e) and alpha particles (with charge +2e) of the same kinetic energy enter a uniform magnetic field B that

Protons and deuterons (each with charge +e) and alpha particles (with charge +2e) of the same kinetic energy enter a uniform magnetic field B that is perpendicular to their velocities. Let rp, rd, and ra be the radii of their circular orbits. Find the ratios rd/rp and ra /rp. Assume that ma = 2md = 4mp.

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