Two 11.0-cm-diameter electrodes 0.75 cm apart form a parallel-plate capacitor. The electrodes are attached by metal wires to the terminals of a 14 V battery.

An engineer has three different capacitors of unknown capacitance. She labels them C₁, C2, and C3. First, she connects C₁ to a battery, and the charge on C₁ is 91 = 32.8 µC. Then, she disconnects and discharges C₁, and connects it in series with C₂. When she connects this series combination of C₂ and C₁ across the battery, the charge on C₁ is 92 22.1 μC. The engineer disconnects the circuit and discharges both capacitors. Next, she connects C3, C₁, and the battery in series, which results in a charge on C₁ of 93 = 25.7 μC. If, after being disconnected and discharged, she connects C₁, C₂, and C3 in series with the battery, what is the charge on C₁ (in µC)? μC

You have two capacitors, one with capacitance 14.3×10−6 F14.3×10−6 F and the other of unknown capacitance. You connect the two capacitors in series with a voltage of 383 V383 V applied across the capacitor pair. You discover that, as a result, the unknown capacitor has a charge of 0.00141 C.0.00141 C. Find its capacitance ?.

(a) When a battery is connected to the plates of a 9.00-µF capacitor, it stores a charge of 216.0 µC. What is the voltage of the battery? V(b) If the same capacitor is connected to another battery and 135.0 µC of charge is stored on the capacitor, what is the voltage of the battery? V