A uniformly charged conducting sphere of 2.4 m diameter has a surface charge density of 80.0 $\mathrm{\mu C}/{\mathrm{m}}^2$. What is the total electric flux leaving the surface of the sphere?

We know that charge on the sphere
= Density x Area
$\begin{array}{l}=80\times {10}^{-6}\times 4\mathrm{\pi }(1.2{)}^2\\ =1.45\times {10}^{-3}\mathrm{C}\end{array}$
Therefore, the total electric flux leaving the surface of the sphere is
$\mathrm{\varphi }=\frac{\mathrm{q}}{{\mathrm{\epsilon }}_0}=\frac{1.45\times {10}^{-3}}{8.86\times {10}^{-12}}=1.6\times {10}^8{\mathrm{Nm}}^2/\mathrm{C}$