1. The problem statement, all variables and given/known data An empty capacitor is connected to a 11.7-V battery and charged up. The capacitor is then disconnected from the battery, and a slab of dielectric material (κ = 3.1) is inserted between the plates. Find the magnitude of the amount by which the potential difference across the plates changes. 2. Relevant equations I did the following steps but did not get the right answer. Is there another step to the problem? 3. The attempt at a solution q=CV, therefore C=q/V C is affected by the k... therefore C(dielectric)= k*C then the equation reads: q/V = k (q/11.7)... and the Q's cancel out. The final equation I worked with is (1/V)=3.1 (1/11.7). The answer I got however is not correct. help.