Net electric flux (ϕNet) through the cubic surface is given by
Where,
εo = Permittivity of free space = 8.854 × 10−12 N−1C2 m−2
q = Net charge contained inside the cube = 2.0 μC = 2 × 10−6 C
The net electric flux through the surface is 2.26 ×105 N m2C−1.
