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Force on charges in square

  1. Apr 24, 2012 #1
    1. The problem statement, all variables and given/known data

    https://img.skitch.com/20120425-x1ekh2xqk9j61xqk83uyspaf75.jpg

    2. Relevant equations

    F=Kq1q2/r^2
    E=kQ/r^2

    3. The attempt at a solution

    Answer choice E is not listed in screenshot, but states that there is no Net force on the Charge. I picked E, but I'm second-guessing myself.
     
  2. jcsd
  3. Apr 24, 2012 #2
    What made you choose E? Are there other options that seem plausible to you which make you second guess yourself?
     
  4. Apr 24, 2012 #3
    Well, I guess I was hoping for a more quantitative way of understanding the vector sums in this equation, without having supplied values.
     
  5. Apr 25, 2012 #4
    Ultimately I just plugged in some variables and my answer held up.
     
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