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- Homework Statement
- A static electric charge is distributed in a spherical shell of inner radius R1 and outer radius R2. The electric charge density is given by ρ=a+br, where r is the distance from the centre, and zero everywhere else.

(i) Find an expression for the electric field everywhere in terms of r.

(ii) Find expressions for the electric potentials and energy density for r < R1. Take the potential to be zero at r→∞.

- Relevant Equations
- ρ=a+br

According to my professor, the solution in this book (pages 20-21) for item (ii) is wrong: https://www.u-cursos.cl/usuario/754...roblems_and_Solutions_on_Electromagnetism.pdf