1. The problem statement, all variables and given/known data When a dielectric is partially inserted between two plates of a capacitor that is disconnected, what will be it's motion? Also what will be its motion if the capacitor is connected to a battery? 2. Relevant equations 3. The attempt at a solution For the first part. I think the lines of electric field are not uniform in the part of the dielectric outside the region of the parallel plate capacitor. So, there will be fringing field which makes dielectric move towards the centre of the capacitor. But i can't figure out what will be the effect when capacitor is connected to the battery?