1. The problem statement, all variables and given/known data Find the electric field inside a hollow non-conducting pear with a surface charge-distribution (axially symmetric too) of σ(r,θ). The charge density σ is zero at the top of the pear, and 600 C/m^2 at the bottom. 2. Relevant equations I'm not sure how to approach the problem ... maybe some application of Laplace's equation. 3. The attempt at a solution The electric field at any point inside the pear will be the superposition of x,y, and z fields. I assume that we can use symmetry about the z-axis to our advantage.