1. The problem statement, all variables and given/known data Inside a sperical dielectric mass there is a electric dipole on the center of the sphere. The sphere has radius a. This dieletric sphere is inside and on the center of a conductive spherical shell of radius b. The problem asks to find the potentials and then the electric fields in every region, inside the dielectric sphere, the space between the sphere and the shell and outside the shell. 2. Relevant equations Its given that p=p0*z (the dipole looks towards +z ) 3. The attempt at a solution Now, i have written all the potentials (the solutions of laplace) but i noticed that i havent fully understood one boundary condition for the electric potential. The one that says ε2(∂Vout/∂r)-ε1(∂V/∂r)=-σ(θ)/ε0. The problem doesnt say anything about the charge of the shell, so i suppose is zero. So my question is this, does the σ(θ) of the above condition refers to the induced charge density (which would not be zero in this example i think) or the charge density of the shell alone?