9. Two capacitors with capacitances Cı = 4µF and C2 = 6µF are connected in parallel to a 120V emf device (battery) and after some long time, they are disconnected from the source and each other. If they are now connected positive plate to negative plate and negative plate to positive plate, calculate the potential across the plates and resulting charge on each capacitor.

4. a)Find the equivalence capacitance between points a and b for the combinations of capacitors shown in figrure if C1 5.0µF, C2 = 10.0µFand C3 = 2.0µF. b) If the potential difference between points a and b is 60.0V, what chrage is stored on C3? C2 C2

3. A 3.00 - uF capacitor and a 6.00 - µF capacitor are discharged and then connected in series, and the series combination is then connected in parallel with an 8.00 - µF capacitor. Diagram this combination. What is the equivalent capacitance of this combination?

You have two parallel plate capacitors, C 1a = 10 nF and C 2a = 20 nF, each with the same area of 2 m^2 that is filled with a dielectric material that is 1 mm thick.   a) If the capacitors are connected in series vs parallel, which provides more total capacitance?   b) What is the difference in total energy if the capacitors are connected in series vs. parallel?   c) What dielectric material would you use in order to make the total capacitance of the capacitors connected in series equal to if they were connected in parallel?  Help...