Hey gang, I am doing a Mastering physics question, and it's got me stumped. >< Q: You need a capacitance of 50.0 microF, but you don't happen to have a 50.0 microfarads capacitor. You do have a 80.0 microF capacitor. What additional capacitor is needed to get a capacitance of 50 microF? I was thinking it has something to do w/ C = Q / deltaV. But that would mean that I would need to have some sort of knowledge of Q. I then tried Ceq = (1/C1 +1/C2)^-1 and solved for 1/C1 to get 49.9875 microF. But that doesn't seem logical (+ I got it wrong ><) Any suggestions / help? Greatly appreciated!