Lets assume that there is a parallel plate capacitor connected across a supply of V volts. Then, there is charge redistribution between the plates such that finally the potential of positive plate wrt the negative plate is V volts. Let us assume air is the dielectric between the two plates. Now what happens if I introduce a plate in between the existing two plates. As per electrical analogy, its as good as two capacitors connected as a capacitor. My question is that will such an arrangement of 3 plates with two plates connected across the supply and with a plate in between these two plates still behave as a capacitor. If so, please explain the physics behind it. Thank you.