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A deuteron and an alpha particle having ...

A deuteron and an alpha particle having equal kinetic energy enter perpendicular into a magnetic field. Let `r_(d) and r_(alpha)` be their respective radii of circular path. The value of `(r_(d))/(r_(alpha))` is equal to :

A

`(1)/(sqrt(2))`

B

`sqrt(2)`

C

1

D

2

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