1)The charge on the positive plate of a capacitor is called the charge on the capacitor.Why? I think it is just a convention. 2)There is a passage in my textbook. Any conducting object that carries a charge is characterized by an electric potential that is constant everywhere on and within that object. If two such conductors have a potential difference between them then as any potential difference is able to accelerate charges,the system effectively stores energy I want to know what is the relation between acceleration of charge and storing energy My understanding:An easy way to accelerate a charge is to allow it to move through a potential difference. For example, if we take a charge and place it inside a parallel-plate capacitor.A positive charge released from (near) the positive plate will accelerate towards the negative plate. Cutting a hole in the negative plate allows it to escape. Similarly, a negative charge released from near the negative plate will accelerate across the gap and leave the parallel plates at high speed.Is energy produced by acceleration of charge something about electron volt :a unit of energy equal to the work done on an electron in accelerating it through a potential difference of one volt. If yes,how it is stored? 3)Any arrangement of two isolated conductors carrying equal and opposite charges can be called as capacitor.The two conductors can be spherical,cylindrical ,or plane sheets.My question is what if one conductor is spherical and the other spherical,I mean can isolated conductors of two different shape/geometry form a capacitor? I think yes as long as both of them equal and opposite charges. 4)Is earthing necessary to form parallel plate capacitors?