Consider a two identical capacitors connected in parallel and connected to a battery. The battery is removed and then a dielectric is inserted between one of the capacitors. Why will charge flow from one capacitor to the one with the dielectric? I know the "potential differences in the capacitors must be equal" but it does not make sense how that is sufficient reason to cause a charge imbalance. It seems unnatural how charge would accumulate when they naturally repel. Can you explain this?