Question

Problem 4c

Answer 1

Given information

The capacitance of the capacitor is C,

The Potential drop across it is V, and 

The charge on the plates is Q.

Step-by-step explanation

Step 1.

Since the voltage is constant, we use the first equation for the potential energy, with the capacitance equal to the product of the initial capacitance and the dielectric constant of the paper.