Question

Charge Q is uniformly distributed throughout a spherical insulating shell. The net electric flux in Nm^2/C through the inner and outer surface of the shell is?

Answer 1

Inside the shell are polarization charges $Q'=-Q.$ Its electric flux the inner and outer surface of the shell is $2\Psi$ where $\Psi= \frac {Q'}{\epsilon_0}$ $\frac{Nm^2}{C}$ according to Gauss law, where $\epsilon_0\approx8.85\times10^{-12} Fm^{-1}$