A circuit used to determine an unknown capacitance has three capacitors connected in series to a 12.0 V ideal power supply. The known capacitors have capacitances of 15 μF and 8.0 μF. The potential difference across the unknown capacitor is measured to be 9.0 V. Work out the capacitance of the unknown.

The three capacitors, C₁ = 9 µF, C₂ = 6 µF, and C₃ = 4 µF are arranged as illustrated in the figure below. A voltage source connected across the combination provides a potential difference, V_PS. Once the capacitors are fully charged, the charge on C₂ is 40 μC. Determine i) the charges Q₁ and Q₃ on each of the capacitors C₁ and C₃ and ii) the numerical value of V_PS. 

The figure below shows an electronic circuit section composed of four capacitors: C₁ = 16 µF, C₂ = 4 µF, C₃ = 8 µF, and C₄ = 8 µF. The circuit is connected between M and N to a battery with a voltage of 100 V. Find the charge stored on each of the capacitors C₁ and C₄.

Determine the charge stored on each capacitor and the voltage difference across them in the circuit shown in the figure below.