A nonconducting spherical shell of inner radius R1 and outer radius R2 has a uniform volume charge density ?. (Use any variable or symbol stated above along with the following as necessary: ?0 and r.)
a. find the total charge on the shell (Q) =
b. Find the expressions for the electric field everywhere. Er (r < R1) = Er (R1 < r < R2) = Er (r > R2) =