I've been thinking about this for a while, and I think people of PF will be able to answer it haha In parallel plate capacitor, we charge the capacitor by connecting a power supply/battery. Then, after few minutes, the capacitor is fully charged with different signs, + and -. With that difference in signs, there must be forces, same magnitude, acting on both plates which draw them closer. What I want to ask is, how do people maintain the distance between the plates? I mean, there are attractive forces, so, there must be another force with different direction right? If not, then the plates will be accelerated toward each other. I am confused by this. Many lectures I've watched never talk about electrostatic forces again after they get to parallel plate capacitor. Ah, another one, how do people maintain potential difference? Doesn't the same problem apply? I just haven't fully understood the concept of voltage yet. Because voltage is generated by point charge and then suddenly it is there by itself, can someone explains to me? Thanks in advance.