A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?

Net electric flux (Φ_Net) through the cubic surface is given by

Φ_Net =q/ε₀

Where,

ε₀ = Permittivity of free space = 8.854 x 10⁻¹² N⁻¹C² m⁻²

q = Net charge contained inside the cube = 2.0 µC = 2 x 10⁻⁶ C

Therefore Φ_Net =(2 x 10⁻⁶)/8.854 x 10⁻¹²

=2.26 x 10⁵Nm²C⁻¹

The net electric flux through the surface is 2.26 x 10⁵Nm²C⁻¹