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An electron , a proton and an alpha ...

An electron , a proton and an alpha particle having the same kenetic energy are moving in circular orbits of raddii ` r_(e ) , r _(p ) , r _(a _ ` respectively in a uniform magnetic field B . The relation between ` r_(e ) , r _( p ) , r _(a ) ` is

A

` r_(e) gt r_(p) lt r_(a) `

B

`r_(e ) lt r_(a) lt r_(p) `

C

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

D

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

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