Gauss law states that the electric flux through any closed surface is proportional to the net electric charge inside the surface. This is expressed mathematically in the form of:
Φ = Q / εo
Where,
Φ = the electric flux = unknown (which we have to find for)
Q = the net electric charge = 5.0 µC = 5 E-6 C
εo = the permittivity of free space = a constant value = 8.85 E-12 C^2 / N m^2
Plugging in the values into the equation will result in:
Φ = 5 E-6 C / (8.85 E-12 C^2 / N m^2)
Φ = 564,971.75 Wb = 5.6 x 10^5 Wb