Question

What is the electric flux associated with one of faces of a cube, when a charge (q) is enclosed in the cube ?

• A. $\frac{6q}{\varepsilon_0}$
• B. $\frac{q}{6\varepsilon_0}$
• C. $\frac{q}{3 \varepsilon_0}$
• D. $\frac{3q}{\varepsilon_0}$

Answer 1

Answer: (B)

Charge q is lying inside the cube. Flux coming out of it $= \frac{q}{\in_0}$. It is now distributed evenly over six faces. So, flux passing through one face
$ = \frac{q}{\in_{0}} \times\frac{1}{6} = \frac{q}{6\in_{0}} $