1. The problem statement, all variables and given/known data A capacitor is formed by 2 square metal plates of edge a and separated by distance d. Dielectrics of dielectrics constants K1 and K2 are filled in the gap as shown. 2. The attempt at a solution This was my initial approach: I integrated the parallel combination of elemental capacitors dC1 and dC2, but I didnt get the correct answer. Next, I tried taking the elemental capacitors in series instead of parallel: This time my answer turned out to be correct. Can someone help me identify the flaw in my initial approach? I suspect I was wrong in assuming that the elemental capacitors were in parallel in the first place. Opinions?