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Homework Help: A coulombs law problem

  1. Jan 29, 2009 #1
    1. The problem statement, all variables and given/known data
    What is the magnitude of the force a +15 µC charge exerts on a +2.6 mC charge 41 cm away?

    2. Relevant equations

    3. The attempt at a solution
    Well I plugged in the numbers for the variables. Converted 15 and 2.6 to coulombs and 41 to meters. I did the math and got like .2088. I have to input my answer on this site and I have five tries to do so. I used three already so I really don't want to screw up again without help...or something like that...you get what I'm saying.
  2. jcsd
  3. Jan 29, 2009 #2


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    Homework Helper

    Welcome to PF.

    I think your orders of magnitude are off. Check your powers of 10.
  4. Jan 29, 2009 #3
    Well you uhh may be right, and thanks for the welcome. I tried it again and I got 2.088 but I put that in and still got it wrong. Me == confused now. Maybe it wants an exact answer or its screwing me over for sig figs or something....maybe I'm just wrong.
  5. Jan 29, 2009 #4
    Ooof I read it over...hehe...yeah I converted 2.6 as if it were micro
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