In this lab, we will determine the capacitance, C1, of an unknown capacitor by which of the following methods? Question 1 options: Observe the potential difference between the plates of unknown capacitor, C1, when it is charged by the source (battery, dry cell or power supply) and when it is fully discharged. Charge C1 to a known voltage then measure its capacitance with a capacitance meter. Charge a known capacitance, C2 to a known voltage, then add C1 to the circuit and measure the charge on C1. Charge C1 to a known voltage, disconnect it from the charge source, then measure the voltage change when C1 is connected to a known capacitor