Question

A point charge +q is placed at the centre of a cube of side L. The electric flux emerging from the cube is-

• A. $\frac{q}{{ϵ}_0}$
• B. Zero
• C. $\frac{6q{L}^2}{{ϵ}_0}$
• D. $\frac{q}{6L^2{ϵ}_0}$

Answer 1

The correct option is A $\frac{q}{{ϵ}_0}$

Applying Gauss's law, electric flux $\left(\varphi \right)=\int \overrightarrow{E}.\hat{n}ds=\frac{Q_{net}}{{ϵ}_0}$
therefore, $\varphi =\frac{q}{{ϵ}_0}$
Ans: (A)