How do I do this?

.A 50.0-m length of coaxial cable has an inner con- Ilductor that has a diameter of 2.58 mm and carries a charge of 8.10 MC. The surrounding conductor has an inner diameter of 7.27 mm and a charge of 8.10 110. Assume the region between the conductors is air. (a) What is the capacitance of this cable? (b) What is the potential difference between the two conductors? 19. For the system of four capaci- tors shown in Figure P26.19 find (a) the equivalent capac- itance of the system, (b) the charge on each capacitor, and (c) the potential differ- ence across each capacitor.\f35. Two identical parallel-plate capacitors, each with capacitance 10.0 MP, are charged to potential differ- ence 50.0 V and then disconnected from the battery. They are then connected to each other in parallel with plates of like sign connected. Finally, the plate separa- tion in one of the capacitors is doubled. (a) Find the total energy of the system of two capacitors before the plate separation is doubled. (b) Find the potential dif- ference across each capacitor after the plate separation is doubled. (c) Find the total energy of the system aer the plate separation is doubled. (d) Reconcile the dif- ference in the answers to parts (a) and (c) with the law of conservation of energy