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The velocity of two alpha particles A an...

The velocity of two `alpha` particles A and B in a uniform magnetic field is in the ratio of `1 : 3`. They move in different circular orbits in the magnetic field.The ratio of radii of curvature of their paths is

A

`1 : 2`

B

`1 : 3`

C

`3 : 1`

D

`2 : 1`

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