Electrostatics

Three point charges \(\mathrm{q},-2 \mathrm{q}\) and \(2 \mathrm{q}\) are placed on $x$-axis at a distance \(x=0, x=\frac{3}{4} R\) and \(x=R\) respectively from origin as shown. If \(\mathrm{q}=2 \times 10^{-6} \mathrm{C}\) and \(\mathrm{R}=2 \mathrm{~cm}\), the magnitude of net force experienced by the charge \(-2 q\) is ___________ N.