A proton and an `alpha -` Particle ( with their masses in the ratio of 1:4 and charges in the ratio of 1:2 ) are accelerated form rest through a potential differeence V, if a uniform magnetic field (B) is set up perpendicular to their velocities , the ratio of the radii `r_(p) : r_(alpha)` of the circular paths described by them will be :
A
`1: sqrt(2)`
B
`1:2`
C
`1:3`
D
`1"sqrt(3)`
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