A capacitor, is fully charged by a battery. The battery is disconnected and a dielectric is inserted into the capacitor. Which of the following is true?
I. Voltage will stay the same
II. Potential energy of the capacitor will increase
III. capacitance will increase
U = 0.5 * Q * deltaV
The Attempt at a Solution
I know that III is true as dielectrics by definition increase capacitance. How can I eliminate the other two to get the final answer of III only?
Thanks in advance.