Question

An electric charge inside a sphere (r=0.81m) has a magnitude of +4.8x10^18C. Find the electric flux through this surface

Answer 1

The electric flux through surface

$$\Phi=\oint EdA=\frac{q}{\epsilon_0}$$ $$\Phi=\frac{4.8*10^{−18}}{8.85*10^{-12}}=5.42*10^{-7}\:\rm N\cdot m^2/C$$