Capacitors inserted into a circuit with opposite polarities

[Alfaraj]

Homework Statement

Two capacitors C1 = 5 μF and C2 = 2 μF are initially charged to a potential difference of V = 100 V. They are inserted into the circuit with opposite polarities as shown. Switches S1 and S2 are now closed. What is the magnitude of the potential difference between points A and B? (Answer in Volts.)

[PLAIN]http://img833.imageshack.us/img833/557/phyr.jpg

Homework Equations

C = Q / deltaV

The Attempt at a Solution

Since both capacitors have same potential difference since they are connected in parallel. I think the answer should be zero since we would have two opposite-sign voltages.

 

[ehild]

No. The voltage will not be zero as the charges are not equal and opposite on the connected plates.

ehild

 

[ehild]

No. The voltage will not be zero as the charges are not equal and opposite on the connected plates.

ehild