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 = (mv^(2))/(R )`
`rArr (K(q)(2q))/(R^(2)) - (2(Kq^(2)))/(sqrt(3)R)^(2) cos 30 = (mv^(2))/(R )`
`rArr v = sqrt((kq^(2))/(Rm)[2-(1)/(sqrt(3))])`