In the diagram shown the charge `+Q` is fixed. Another charge `+2q` and mass M is projected from a distance R from the fixed charge. Minimum separtion between the two charge if the velocity becomes `1/sqrt3` time of the projected velocity, at this moment is (Assume gravity to be absent)

Options

A. `(sqrt(3))/(2)R`
B. `sqrt(3)R`
C. `1/2R`
D. `4R`

Answer

a

Explanation

Using conservation of angular momentum about fixed chaged.
`MV sin 30R=Mv'.rimplies (V)/(2)R=(V)/(sqrt(3))r`
`r=(sqrt(3))/(2)R`