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Homework Help: Electric field problem (never mind )

  1. Feb 4, 2010 #1
    1. The problem statement, all variables and given/known data
    What magnitude charge creates a 8.1 N/C charge at 3.00m away?
    (Masteringphysics wants it in nC)

    2. Relevant equations
    E=KQ/d^2


    3. The attempt at a solution
    E=KQ/d^2 [tex]\rightarrow[/tex] Q=E*d^2/K

    E=8.10 N/C
    K=8.99*10^9Nm^2/C^2
    d=3.0m

    Q=[tex]\frac{(8.10 N/C)(9.0m^2)}{(8.99*10^9 Nm^2/C^2)}[/tex]= 8.1*10^-9C

    Converted to nC, the answer should be 8.1*10^-3, shouldn't it? I've also tried 10^-15 in case I was being dumb with the exponent rules. I also converted the 8.1 N/C into N/nC and received the same answer, yet MasteringPhysics keeps saying it's wrong and I can't seem to find my source of error

    EDIT: delete this thread, I just realized that "nano" is 10^-9, not -6. Answer was 8.1 nC. Whoops. ._.
     
    Last edited: Feb 4, 2010
  2. jcsd
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