1. The problem statement, all variables and given/known data In the figure, V = 10 V, C1 = 13 µF and C2 = C3 = 23 µF. Switch S is first thrown to the left side until C1 reaches equilibrium. Then the switch is thrown to the right. When equilibrium is again reached, how much charge is on capacitor 1? 2. Relevant equations 3. The attempt at a solution At first, C1 is in parallel with the battery so the voltage across it is known, and since it's capacitance is given we also know the charge. But when the switch is thrown, can I act as if the battery is completely disconnected from the circuit? If so, I should act as if C1 is the battery now, shouldn't I? But if so, how do I look at that situation to determine the charge on C1 after equilibrium?