Compute all parts of given question:
Question: A conducting spherical shell of inner radius a = 0.8 m and outer radius b = 1.0 m carries a charge of QC = -20 µC. A uniformly-charged sphere of radius RS = 2.0 cm and charge QS = + 15 µC is placed in the center of the shell.
Part A: Find the electric field everywhere (including direction) as a function of the radial distance r from the center.
Part B: What are the charges on the inner surfaces of the shell?
Part C: What are the charges on the outer surfaces of the shell?
Part D: What is the electric potential (relative to inanity) on the outer surface of the shell?
I need help to find the charges on the inner surfaces of the shell.