A capacitor C1 is connected to a supply. When a potential difference of 4.0 V is applied across the capacitor, it stores a charge of 0.80 nC a) Calculate the electrical work done by the supply as it transfers this charge The equaton used is W=QV Why is it QV and not 0.5QV, which is usually used? b) Mark on the diagram above the magnitudes and polarities of the charges stored on the plates of the capacitor ________ l..............l =C.........4V l_______l This is what the diagram looks like. Ignore the dots. Its basically a emf on the right and a capacitor in series. The answer is +0.8 (nC) on top plate and –0.8 (nC) on bottom plate . How do we know which plate is +/-? c) With capacitor C1 charged to 4.0 V, the supply is removed and a second, uncharged capacitor C2 is connected in its place. Capacitor C1 transfers 0.2nC to the plates of capacitor C2. As a result the potential difference across C1 falls to 3.0 V Draw a graph of charge stored on C2 (y axis) against pd (x axis). The graph is a straight line from (0,0) to (3 , 0.2) However, shouldnt the voltage be 1, as there is 3 volts aross C1, and since the capictor are in series, C2 should be 1V to make 4V total?