Question

The potential of a coaxial cylinder with charge density 1 unit , inner radius 1m and outer cylinder 2m is (in 10^9)

(a) 12.74

(b) 13.47

(c) 12.47

(d) 13.74

This question was posed to me in final exam.

I need to ask this question from Gauss Law topic in section Electrostatic Fields of Electromagnetic Theory

Answer 1

Correct option is (c) 12.47

To elaborate: The potential of a coaxial cylinder will be ρl ln(b/a)/2πε, where ρl = 1, b = 2m and a = 1m. We get V = 12.47 X 10^9 volts.