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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 trajectories in a constant magnetic of the trajectories of these particle, then

A

`r_(e) gt r_(p)=r_(He)`

B

`r_(e) gt r_(p)gtr_(He)`

C

`r_(e) lt r_(p) lt r_(He)`

D

`r_(e) lt r_(p)=r_(He)`

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The correct Answer is:
D
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