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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

A

0.043055555555556

B

0.044444444444444

C

0.052777777777778

D

0.16736111111111

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