A proton an an alpha-particle, moving wi...

A proton an an `alpha-`particle, moving with the same velocity, enter a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths descirbed by the proton and `alpha`-particle is

`1 : 2`

`1 : 4`

`1 : 16`

`4 : 1`

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