A proton, a deuteron and an alpha partic...

A proton, a deuteron and an `alpha` particle are accelerated through same potential difference and then they enter a normal uniform magnetic field, the ratio of their kinetic energies will be

`2 : 1 : 3`

`1 : 1 : 2`

`1 : 1 : 1`

`1 : 2 : 3`

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