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An electron, a proton and an alpha parti...

An electron, a proton and an alpha particle having the same kinetic energy are moving in cirular orbits of radii `r_(e), r_(p), r_(alpha)` respectively in a uniform magentic field B. Then relation between `r_(e), r_(p), r_(alpha)` is

A

`r_(e) lt r_(p) lt r_(alpha)`

B

`r_(e) lt r_(alpha) lt r_(p)`

C

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

D

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

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