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A proton, a deuteron and an a particle h...

A proton, a deuteron and an a particle having same momentum enter a uniform magnetic field at right angles to the field. Then the ratio of their angular momenta during their motion in the magnetic field is

A

`2:2:1`

B

`2:1:3`

C

`4:1:2`

D

`4:2:1`

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The correct Answer is:
A
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