A 10.0-F parallel-plate capacitor with circular plates is connected to a 12.0-V battery. (a) What is the

Question:

A 10.0-µF parallel-plate capacitor with circular plates is connected to a 12.0-V battery.
(a) What is the charge on each plate?
(b) How much charge would be on the plates if their separation were doubled while the capacitor remained connected to the battery?
(c) How much charge would be on the plates if the capacitor were connected to the 12.0-V battery after the radius of each plate was doubled without changing their separation?