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An electron, a proton, a deuteron and an...

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

A

`R_e = R_p`

B

`R_p = R_d`

C

`R_d = R_(alpha)`

D

`R_p = R_alpha`

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The correct Answer is:
C
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