It is neither a homework nor coursework problem, but I really want to know the solution. 1. The problem statement, all variables and given/known data 3 charged capacitors are connected as shown in the diagram. What will be their final charges, potential difference when equilibrium is reached? Units are arbitrary. http://imageshack.us/photo/my-images/19/cap1zu.jpg 2. Relevant equations Q=CV obviously 3. The attempt at a solution (1) Should I use the charge conservation? E.g. The total charge on left plates of C1 and C2 is 1+4=5 units, on right plate of C2 and left plate of C3 is -4+9=5 units, on right plates of C1 and C3 is -1-9=-10 units (2) p.d. across C1 = p.d. across C2 and C3? Equivalent capacitance across C2 and C3 = 1.2 unit Then I cannot continue... How about the case if the polarity of one of the capacitors is reversed? I feel really, really confused.