Problem: A hollow metal sphere, radius 5 cm, has a charge of 2e-7 Coulombs placed on it. It is surrounded by a thin concentric metal shell radius 15 cm that has a charge of -2e-7 Coulombs on it.
Part A: Find the flux of electric field through a closed spherical surface if the surface is at r=2.5cm, then 10 cm, and finally at 20cm using Gauss' Law.
Please explain how you came to your conclusion.