A capacitor of unknown capacitance C is charged to 100 V and connected across an initially uncharged 60 mF capacitor. If the final potential difference across the 60 mF capacitor is 40 V, what is C?

Problem 6:  Suppose you have a 9.00 V battery, a 3.8 μF capacitor, and a 7.85 μF capacitor.  Part (a)  Find the total charge stored in the system if the capacitors are connected to the battery in series in C.   Part (b)  Find the energy stored in the system if the capacitors are connected to the battery in series in J.  Part (c)  Find the charge if the capacitors are connected to the battery in parallel in C.  Part (d)  Find the energy stored if the capacitors are connected to the battery in parallel in J.

A parallel-plate capacitor has square plates that have edge length equal to 1.20×10^2cm and are separated by 1.00 mm. It is connected to a battery and is charged to 12.0 V. 1)How much energy is stored in the capacitor? (Express your answer to three significant figures.)

A 2.7 µF capacitor and a 5.4 µF capacitor are connected in parallel across a 230 V potential difference. Calculate the total energy in joules stored in the capacitors.