Application: Charge density in coaxial cable connected to a battery. A very long, solid cylindrical conductor of radius b is placed at the center of an equally long, thin, cylindrical shell of radius a as shown in Figure 4.64 to form a coaxial line and a voltage source is connected as shown. Calculate:
(a) Charge density per unit area on the central conductor.
(b) Charge density per unit area on the outer shell.
