In finding the electric field using gauss law the formula $\left|\overrightarrow{E}\right|=\frac{Qenclosed}{{\in }_0\left|A\right|}$  is applicable. In the formula ${\in }_0$ is permittivity of free space,  A is the area of Gaussian surface and $Q_{enclosed}$  is charge enclosed by the Gaussian surface . The equation can be used in which of the following  situation