A proton and a deuteron both having the ...

A proton and a deuteron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field `B`. For motion of proton and deuteron on circular path or radius `R_(p)` and `R_(d)` respectively, the correct statement is

`R_(d)=sqrt(2)R _(p)`

`R_(d)=R_9p)//sqrt(2)`

`R_(d)=R_(p)`

`R_(d)=2R_(p)`

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