29. A second uncharged capacitor of the same size and shape, but with a dielectric (porcelain), was connected in parallel to an air capacitor charged to a potential difference of U = 600 V and disconnected from the voltage source. Determine the dielectric constant ε of porcelain, if after connecting the second capacitor, the potential difference decreased to U1 = 100 V.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)