A proton, a deuteron and an alpha- parti...

A proton, a deuteron and an `alpha`- particle having the same kinetic energy are moving in circular trajectors in a constant magnetic field. If `r_p, r_d` and `r_(alpha)` denote respectively the radii of the trajectories of these particles then

`r_(a) = r_(p) lt r_(d)`

`r_(a) gt r_(p) gt r_(d)`

`r_(a) = r_(d) gt r_(P)`

`r_(p) = r_(d) = r_(a)`

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