# A deuteron and an alpha particle having same momentum are in turn allowed to pass through a magnetic field , acting normal to the direction of motion of the particles. Calculate the ratio of the radii of the circular paths described by them.

We know that deuteron has charge of +e and mass  where  is the mass of the proton,

Similarly,

- particle has charge of  and mass  .

The radius of the circular path

Since momentum are same (given in the question) and B is also constant,

therefore

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