conflicting results. find the potential between the two conductors of a coaxial cable I have already found E.... E = lambda / 2 pi r epsilon my question: What are the integration limits for finding the potential between the conductors? say we have a radius a (inner conductor) and a radius b (outer conductor). do i integrate between a and b to find the potential between them? This video says yes... however if i do that V between the conductors will be CONSTANT i.e the integral will give log of a over b. This video says no... in this video he takes the limits between r and b, thus his solution will be a function of r, NOT CONSTANT. then he draws a graph to show it. SO is the potential between the conducting plates constant (ln (a/b)) or NOT constant (ln (b/r)). thanks for any help!