In the figure the capacitances are C1 = 1.5 μF and C2 = 2.5 μF, and both capacitors are charged to a potential difference of V = 86 V but with opposite polarity as shown. Switches S1 and S2 are now closed. (a) What is now the potential difference between points a and b? What now is the charge on capacitor (b) 1 and (c) 2?