Question: A 10.0 uF parallel-plate capacitor is connected to a 12.0 V battery. After the capacitor is fully charged, the battery is disconnected without loss of any of the charge on the plates.
a) A voltmeter is connected across the two plates without discharging them. What does it read?
b) What would the voltmeter read if the plate separation were doubled?
c) What would the voltmeter read if the radius of each plate was doubled, but the separation between the plates was unchanged?