Three equal point charges of charge +q each are moving along a circle of radius R and a point charge -2q is also placed at the centre of circle (as shown in figure). If charge are revolving with constant and same speed in the circle then calculate speed of charges

Explanation

`F_(2)-2F_(1) cos 30^(º)=(mv^(2))/R`
`implies (K(q) (2q))/R^(2)-(2(Kq^(2)))/((sqrt(3)R)^(2)) cos 30 = (mv^(2))/R`

`implies v=sqrt((kq^(2))/(Rm) [2-1/sqrt(3)])`