Q 1267378285.     A proton and an alpha particle, after being accelerated through same potential difference, enter uniform magnetic field, the direction of which is perpendicular to their velocities. Ratio of radii of their circular paths will be

A

`r_p/r_α = 2`

B

`r_p/r_α = 4`

C

`r_p/r_α = 1/2`

D

`r_p/r_α = 1/sqrt2`

HINT

Use the concept of moving charge partical in uniform magnetic field. `r = (mv)/(qB) `

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