1. The problem statement, all variables and given/known data I'm almost embarrassed to post this, but insofar none of my searches online have yielded any results. My question is simply, given a parallel plate capacitor (for the purpose of simplicity let's assume that there are no edge effects) whose constituent plates have charge +aQ and -bQ (a and b are some random number) respectively, what is the capacitance? 2. Relevant equations C=Q/V 3. The attempt at a solution My main problem lies in determining what the 'Q' term in the equation above is. Is it simply an average of both charges? (Both plates have the same area in this example) All examples I have seen so far assume both plates have the same charge, and I've not been able to find an example where this is not the case. Thank-you in advance.