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Homework Help: Line charge density

  1. Sep 13, 2009 #1
    1. The problem statement, all variables and given/known data

    A straight wire 7.0m long carries 30uC distributed uniformly over its length.
    What is the line charge density on the wire?

    _____ uC/m

    2. Relevant equations

    A) E = 2k/lamda /

    B) E = kq/r

    some other ones?

    3. The attempt at a solution

    I sub B into a, and got q/2 = 15. But its not correct. Which formula do I use?
  2. jcsd
  3. Sep 13, 2009 #2

    Hint: You're given charge and length and asked to calculate charge per unit length...shouldn't be too hard to figure this one out ;)
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