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Finding the voltage at a radius of a cylinder

  1. Oct 8, 2016 #1
    1. The problem statement, all variables and given/known data
    cb57d2c60a.jpg

    2. Relevant equations
    Vab = ∫ E*dr

    3. The attempt at a solution
    9974a6964b.jpg


    For part (b) I am not sure if I should set the upper and lower bound of the integral from "R" to "2R" or "2R" to "3R". If done so, this would give me V2R = Vab * ln|3R/2R| / ln |3| instead of what is on the image.
     
  2. jcsd
  3. Oct 9, 2016 #2

    kuruman

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    The problem is asking you to find the potential difference (i.e. voltage) between a point on the inner cylinder at r = R and a point at r = 2R. What do you think the limits of integration ought to be?
     
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