The system of four point charges are arranged to be in equilibrium (see figure) under only mutual elestrostatic forces. Find magnitude of `Q` (in `muC`). (Neglect gravity)

Answer

1

Explanation

`F_(2)-2F_(1)cos30^(@)=0`
`implies(K(q)(Q))/(R^(2))=(2(Kq^(2))/((sqrt(3)R)^(2))) cos 30^(@)`
`Q=q/(sqrt(3))=(sqrt(3))/(sqrt(3))muC=1muC`