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Proton, Deuteron and alpha particle of the same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, deuteron and alpha particle are respectively \( r_{p}, r_{d} \) and \( r_{\alpha} \).
\( \mathrm{P} \) Which one of the following relations is correct?
(A) \( \mathrm{r}_{\alpha}\mathrm{r}_{\mathrm{d}}\mathrm{r}_{\mathrm{p}} \)
(B) \( r_{\alpha}=r_{d}r_{p} \)
(C) \( r_{\alpha}=r_{p}=r_{d} \)
(D) \( \mathrm{r}_{\alpha}=\mathrm{r}_{\mathrm{p}}\mathrm{r}_{\mathrm{d}} \)
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