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Homework Help: Uniformly-charged Thin Rod

  1. Feb 20, 2010 #1
    1. The problem statement, all variables and given/known data
    If the total charge on a rod of length 0.4 m is 2.6 nC, what is the magnitude of the electric field at a location 1 cm from the midpoint of the rod?

    2. Relevant equations
    [(2QK)/(Y)](1/sqrt(L^2 + 4[(Y)^2]), K = 8.99E9

    I don't know if the above equation is actually correct.

    3. The attempt at a solution

    [2(2.6E-9)(8.99E9) / (0.01)] * 1 / sqrt(0.4^2 + 4(0.01^2)]

    = 11700 N/C

    Can anyone check if this is correct? I don't think it's correct.
  2. jcsd
  3. Feb 20, 2010 #2


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    Homework Helper

    I don't think it's correct. How did you get it?
  4. Feb 20, 2010 #3
  5. Feb 20, 2010 #4


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    Homework Helper

    Oops, I made a mistake. That equation is actually right, but you should derive it yourself rather than just plugging numbers into an equation.
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