A parallel-plate capacitor of plate area A and plate separation d. A potential dif- ference Vo is applied between the plates by connecting to a battery between them. The battery is then disconnected, and a slab of thickness b (with b < d) and dielec- tric constant K is placed between the plates. Assume A = 120 cm², d = 1.25 cm, Vo = 87.5 V, b=0.750 cm, and k= 3.54. (a) What are the capacitances Co before the dielectric slab is inserted and the free charge q appearing on the plates? (b) What is the capacitance with the dielectric slab in place between the plates of the capacitor? (c) What are the energies stored in the capacitor before and after the dielectric slab is inserted?