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Homework Help: Find electric field

  1. Apr 21, 2012 #1
    1. The problem statement, all variables and given/known data

    Find the electric field produced by a 2.5uC point charge at distance of 0.75m.

    E = ___ V/m

    2. Relevant equations

    E = kq/r^2

    3. The attempt at a solution

    E = (9x10^9 Nm^2/C^2)(25)/(0.75)^2 = 400 x 10^9

    My concern is about the units I am being asked. Since K is using Nm^2/C^2, how do I convert it to V/m IF IT´S CORRECT, of course.

    Thanks in advance!!
  2. jcsd
  3. Apr 21, 2012 #2
    N/C is equivalent to V/m. There is no need to worry about conversions. The units of K cancel with the ones for q and r^2 to give you N/C
  4. Apr 22, 2012 #3
    Hi, thanks for the reply. Does my answer seem correct to you? Am I on the right track?
  5. Apr 22, 2012 #4
    Anyone? Please, time is really short for me and I really need quick help here. Please.
  6. Apr 22, 2012 #5
    I just need a confirmation. I posted the calculus and values. Are they correct?
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