Question

Two `alpha`-particles have the ratio of their velocities as 3:2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is
A. `2:3`
B. `3:2`
C. `9:4`
D. `4:9`

Answer 1

Correct Answer - B
`"As "qvB=(mv^(2))/(r)`
`therefore" "r=(mv)/(qB)rArr r prop v or(r_(A))/(r_(B))=(v_(A))/(v_(B))=(3)/(2)`