Question

Status enter a charge q is placed at the centre of the cube of side l and

Answer 1

If charge is placed in the centre of cube,

flux through  surface of cube is 6ϕ6ϕ , where ϕϕis flux through each face.

by Gauss's law,

6ϕ=q∈06ϕ=q∈0

=> ϕ=q6∈0