# Problem: A parallel-plate capacitor is charged by a 20.0V battery, then the battery is removed.a. What is the potential difference between the plates after the battery is disconnected?b. What is the potential difference between the plates after a sheet of Teflon is inserted between them?

###### FREE Expert Solution

The charge stored on a capacitor:

$\overline{){\mathbf{Q}}{\mathbf{=}}{\mathbf{C}}{\mathbf{V}}}$

(a)

The capacitor is charged to Q = CV = C(20)

The capacitance remains unchanged. When the capacitor is disconnected,

###### Problem Details

A parallel-plate capacitor is charged by a 20.0V battery, then the battery is removed.

a. What is the potential difference between the plates after the battery is disconnected?

b. What is the potential difference between the plates after a sheet of Teflon is inserted between them?