.• CALC A solid insulating sphere has radius R and carries positive charge distributed throughout its volume. The charge distribution has spherical symmetry but varies with radial distance r from the center of the sphere. The volume charge density is p(r) = Po(1 – r/R), where po is a constant with units of C/m³. (a) Derive an expression for the electric field as a function of r for r < R. (b) Repeat part (a) for r > R. (c) At what value of r, in terms of R, does the electric field have its maximum value?

.• CALC A solid insulating sphere has radius R and carries positive charge distributed throughout its volume. The charge distribution has spherical symmetry but varies with radial distance r from the center of the sphere. The volume charge density is p(r) = Po(1 – r/R), where po is a constant with units of C/m³. (a) Derive an expression for the electric field as a function of r for r < R. (b) Repeat part (a) for r > R. (c) At what value of r, in terms of R, does the electric field have its maximum value?