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Homework Help: Electric potential

  1. Mar 9, 2016 #1
    1. The problem statement, all variables and given/known data
    A wire carrying a charge density of λ=.1c/m is bent into a circle of radius r = 5 cm. What is the electric potential at the center of the circle
    2. Relevant equations


    3. The attempt at a solution
    λ/2Ԑ0 is this right? i do not really understand it or where my radius went
     
    Last edited: Mar 9, 2016
  2. jcsd
  3. Mar 9, 2016 #2

    Charles Link

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    Homework Helper
    Gold Member

    It does appear the potential is ## V=Q/(4*\pi*\epsilon_o*r) ## and ## Q=2*\pi*r*\lambda ## A more lengthy approach to compute V would be to integrate the electric field from the center to infinity. Anyway, I think you can see how the "r" dropped out. Your answer is correct. The potential from a distribution of charges is the sum of all the potentials from infinitesimal elements of these charges.
     
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