JEE · NEET Previous Year Question

In finding the electric field using gauss law the formula $\text{|}E\to \text{|}=\frac{q_{\text{inc}}}{{ϵ}_o\text{|}A\text{|}}$ is applicable. In the formula ${ϵ}_o$ is permittivity of free space, A is the area of Gaussian surface and $q_{\text{inc}}$ is charge enclosed by the Gaussian surface. This equation can be used in which of the following situation?

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.