Hello, I'm studying for an exam tomorrow and am facing a question I can't for the life of me fathom. " A PP air capacitor is made by using to plates 16 cm squared, spaced 4.7 mm apart, connected to a 12V battery" Find Capacitance, charge on each plate, electric field between plated, energy stored in the capacitor. If the battery is disconnected and then the plated pulled apart to a separation of 9.4 mm repeat answers. I have no problem solving the first round of questions but when repeating with the new distance as expected capacitance halves. using C=Q/V i try and figure out Q (Q=CV) mathematically i expect Q to halve since Capacitance has also halved physically i know theres been no change in charge Since it is connected to a battery i can't justify in my mind the voltage increasing to 24V in order to harmonize my physical answer and my mathematical answer... I think im making mountains out of mole hills... i guess exam season will sometimes throw logic out the window. help please?