1. The problem statement, all variables and given/known data Dual plate capacitor with two dielectric slabs placed between the capacitors and a battery supply's a voltage across the capacitors. The slabs are not equal in dielectric permeability. What is the charge at the interface of the two slabs? 2. Relevant equations 3. The attempt at a solution Would the charge be zero between them since insulators don't let charge through or would there be a way for the charge to develop between them? I can't find any information talking about the space between them.