Why are we assuming the sphere as a shell Volume sho uld be

Last updated: 6/12/2023

Why are we assuming the sphere as a shell Volume sho uld be 4 3pir 2 but why 4pir 2 Make the solution clear with theory 7 An insulating solid sphere of radius R is charged in a non uniform manner such that volume charge A density p r where A is positive constant and r is the distance from the center Electric field at any inside point at r r is 1 4 A 1 4 EO 1 3 A 1 A 2 4E0 4 A