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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

A

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

B

`r_(alpha) gt r_(d) gt r_(p)`

C

`r_(alpha)=r_(d) gt r_(p)`

D

`r_(p)=r_(d)=r_(alpha)`

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