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Homework Help: Find the electric potential

  1. Feb 12, 2010 #1
    1. The problem statement, all variables and given/known data

    A wire that has a uniform linear charge density of 2.2 μC/m is bent into the shape as
    shown below, with radius 3.7 m.

    The Coulomb constant is 8.98755 × 109 N · m2/C2. Find the electrical potential at point p.

    Here is the image:
    http://s769.photobucket.com/albums/xx339… [Broken]

    (Radius is 3.7 and the distance of line is 7.4)
    Answer in units of V.

    2. Relevant equations

    V = - integral (E dl)

    3. The attempt at a solution

    I am at a total loss as to how to solve this. First I thought that since the density is uniform, we won't have to integrate. But I am guessing that integration will be done on this one first for the line and then for the circle. But I am totally stuck as to what to integrate, and what will be the limits of integration.

    On this one I spent about 1 hour, but I have reached to no conclusion. I need help on this one! :)

    PLEASE HELP!!! :)

    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Feb 12, 2010 #2
    okay - time is up now - now I can see the solution..........
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