I need clarifications on the following points regarding a capacitor in general. 1.When you bring another conductor near a charged conductor, the capacitance of the latter is said to increase, because the presence of the second conductor near the first one lowers the potential of the former. Otherwise it should imply that the ability of the latter to hold charges should increase. But it is said that the capacitance of a conductor purely depends on its shape and size and the medium but not on the charge or potential. Like the capacity of a water tank depends only on its size but not on the amount of water! If it is so, in this case, how the presence of a neighboring conductor can increase the capacity of the conductor as its shape or medium in which it is placed no where changes? 2. It is said that the charges in a parallel plate capacitor is stored inside the dielectric portion but not on the plates. How could it be? Is it not the natural choice of the charges to go and stay only on the surface of a conductor? 3. Since the field inside a closed conductor is zero it is always safe to be inside a closed car rather than under a tree during lightning. OK. But if it is an enclosure made by a nonconductor such as a plastic, then what will happen to a person inside it during lightning? What will be the explanation? I will be grateful to the forum members if they share their elaborate views on the above doubts that linger in me for quite a long time.