1. The problem statement, all variables and given/known data I have come upon a number of problems where there are two or three different dialectrics inside a capacitor. according to the solutions manual I can often treat the dialectrics as capacitors in series or parallel. My question is why can you treat them as capacitors? Isn't the definition of a capacitor two plates of equal and opposite charge? Are not most dialectrics insulators? how do we know that both ends of the dialectric have equal and opposite charge? 2. Relevant equations C=qv, v=-∫Eds 3. The attempt at a solution If there are two dialectrics "in series" between a capacitor I know that the dialectric next to the positve end of the capacitor aquires a slightly negative charge due to induction but the other end that is next to the other dialectric is where I am having difficulty.