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Electrostatic Forces in Equilateral Triangle

  1. Jan 12, 2017 #1
    < Mentor Note -- New member is reminded to use the Homework Help Template when posting schoolwork questions at the PF >

    Greetings everybody,
    I've encountered a question about electrostatic forces on vertices of an equilateral triangle and I believe that I solved it correctly but my Physics teacher has marked it as incorrect. Am I correct? Amy clue why my Physics teacher marked it wrong? This is the question and the Physics teacher's marking of my answer. I attached it as well in case the link's dead.
    https://s27.postimg.org/p7kkt5pbn/IMG_3511.jpg
     

    Attached Files:

    Last edited by a moderator: Jan 12, 2017
  2. jcsd
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