1. The problem statement, all variables and given/known data For a dielectric slab of relative permeability er fills the space between z = ±a in the xy-plane, and contains uniform density of free charge ρf per unit volume. Find E, D and P as functions of z. 2. Relevant equations P = εoXeE D = εrεoE ∇×P=εoXe(∇×E) = 0 ∇×D=εo(∇×E)+∇×P=0 3. The attempt at a solution Well I have been looking online and through lecture notes and have found dielectric equations for E, D and P but I am not sure what to do with them. I have found examples to do with dielectric slabs between capacitors with thickness 2d and I assume this is what my question must be based from(z = ±a, z(thickness) = 2a). I am sure that I have all the relevant equations but with no values to enter into them. If P, D and E are all vectors in the x,y and z axis is it maybe a case of calculating the curls and looking at the z component? Not sure what to do from here, please help.