A 50 meter length of coaxial cable has a solid cylindrical wire inner conductor with a diameter of 2.58 millimeter and carries a charge of 8.1 µC. The surrounding conductor is a cylindrical shell and has an inner diameter of 7.27 millimeter and charge of -8.1 µC. suppose the region between the conductors is air.
a) Find the capacitance of this cable?
b) Find the potential difference between the two conductors?