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## Homework Statement

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

## Homework Equations

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.