Chapter 6, Problem 6.10P

A coaxial cable has conductor dimensions of a = 1.0 mm and b=2.7 mm. The inner conductor is supported by dielectric spacers (e> = 5) in the form of washers with a hole radius of 1 mm and an outer radius of 2.7 mm, and with a thickness of 3.0 mm. The spacers are located even 2 cm down the cable. (a) By what factor do the spacers increase the capacitance per unit length? (b) If 100 V is maintained across the cable, find E at all points.