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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

A

`1 : 2 : 2`

B

`2 : 2 : 1`

C

`1 : 2 : 1`

D

`1 : 1 : 2`

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The correct Answer is:
D
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