Problem: A 4.7-nF parallel plate capacitor with a sheet of Mylar filling the space between the plates is charged to a potential difference of 157.0 V and is then disconnected.
Part A: How much work is required to completely remove the sheet of Mylar from the space between the two plates?
Part B: What is the potential difference between the plates of the capacitor once the Mylar is completely removed?
I need help to find the potential difference between the plates of the capacitor.