S. In the network shown below, the three capacitors Cl, C2, and C3 are identical air-filled capacitors, each with capacitance C. A potential difference Vab is applied between points a and b. a b Ca l (a) Find the total potential energy UI- stored in this network. (b) A dielectric with dielectric constant K = 3 is inserted between the plates of C3, completely filling the space between them. The applied potential difference Vab is held constant during this process. Find the total potential energy UH now stored in the network. (c) The dielectric is removed from C3 and is inserted between the plates of C1. Again, the applied potential is held fixed during this process. Find the total potential energy Um now stored in the network. (d) Rank the potential energies Ui, U, and Um from largest to smallest. 6. A spherical capacitor is composed of a solid conducting sphere concentric with a larger spherical conducting shell. The inner conductor has positive total charge Q and radius R. The outer conductor has negative total charge Q, inner radius SR, and outer radius 4R. The space between the conductors is filled with two spherical dielectric shells. The dielectric in the region R