Deuteron has charge of +e and mass 2mp where mp is the mass of proton.
-particlehas charge of +2e and mass 4mp.
We know that force on a charged particle due to magnetic field is given by
v and B are perpendicular in this case
Since here because
We can observe the trajectory is circular due to centrifugal force
Fc whose magnitude is given by
Equating 1 and 2
Rearranging we get,
Since momentum p=mv
Now according to question,
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