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Given charge of uniform density. What is the electrical potential @?

  1. Apr 12, 2013 #1
    1. The problem statement, all variables and given/known data
    Charge of uniform density 4.50nC/m is distributed along the circle of radius R. What is the electrical potential (relative to zero at infinity) at the centre of the circle?

    Answer: 254V

    2. Relevant equations
    electric potential: V=kQ/r

    3. The attempt at a solution
    Because the charge of uniform density is 4.50 x 10^-9 C/m
    I would assumed that would equal to Q/r, and all I need to do is multiply it by k, 8.99 x 10^9Nm^2/c^2.

    V= (8.99 x 10^9)(4.50 x 10^-9) = 40.455V

    Of course this is incorrect, tried searching it up on google, but failed. :(
     
  2. jcsd
  3. Apr 12, 2013 #2

    haruspex

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    If it's 4.50nC/m, what's the total charge, Q?
     
  4. Apr 12, 2013 #3
    OHH!!!! haha thanks i got it now :)

    4.50nC/m * 2pi * k = 254.5V
     
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