# Q 1.17 (b): Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is $8.0\times 10^{3}\frac{Nm^{2}}{C}$.If the net outward flux through the surface of the box were zero, could you conclude that there were no charges inside the box? Why or Why not?

Using Gauss's law , we know that  $\phi = q/\epsilon _{0}$