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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
[UPSEAT 2004]
(a) \( R_{e}=R_{\mathrm{p}} \)
(b) \( R_{p}=R_{d} \)
(c) \( \quad R_{d}=R_{\alpha} \)
(d) \( R_{p}=R_{\alpha} \)
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