Can you help give a very detailed explanation on what i know?

This is to give me some clarity when i'm solving a problem

Using Gausian Law, Can i get the Electric Field at this point? From what I know Gausian is only applicable at the lateral surface Electric Field Volume Charge Since I know that the Magnetic Flux is 0= = J B. da Can i say the total magnetic flux in this circular LOOP Current is Magnetic Field OB = |B . da Current Where da is the shared area (nR2)