Two infinite planes each with uniform surface charge density  $+\sigma$ are kept in such a way that the angle between them is ${30}^o$ . The electric field in the region shown between them is given by

Electric field due to each sheet is uniform and equal to$E=\frac{+\sigma }{2{\in }_0}$

Now net electric field between plates

                         $$\begin{gathered} {\overrightarrow{E}}_{net}=E\cos {60}^0\left(-\widehat{x}\right)+\left(E-E\sin {60}^0\right)\widehat{y} \\ =E\left[\left(-\frac{\widehat{x}}{2}\right)+\left(1-\frac{\sqrt{3}}{2}\right)\widehat{y}\right] \\ =\frac{+\sigma }{2{\in }_0}\left[\left(1-\frac{\sqrt{3}}{2}\right)\widehat{y}-\frac{\widehat{x}}{2}\right] \end{gathered}$$