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Homework Help: A +12 nC charge is located at the origin

  1. Apr 10, 2009 #1
    A +12 nC charge is located at the origin.

    What are the electric fields at the positions (x,y) = (5.0 cm, 0 cm), (-5.0 cm, 5.0 cm), (-5.0 cm, -5.0 cm)? Write each electric field vector in component form.

    I got the answer for the first one, but I can't figure out how to get the answers for the second and third ones. The answers are suppose to be (-1.53*10^4 i + 1.53*10^4 j) N/C and (-1.53*10^4 i - 1.53*10^4 j) N/C, respectively.

    Thank you!
  2. jcsd
  3. Apr 10, 2009 #2


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    It's just the same as the first one, except now instead of r=5cm, you have to use the pythagorean theorem to find r.
  4. Apr 10, 2009 #3
    I've tried that, but it gives me an answer of 2.16*10^4 N/C , instead of the answer of 1.53*10^4 N/C, and I can't figure out why.
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