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Homework Help: Place third charge so that it experiences no force

  1. Jan 25, 2007 #1
    1. A +6.2 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force?

    2. F=kq_1q_2/r^2

    3. I got 3.48 as the velocity between the first to charges. Now im stuck.
  2. jcsd
  3. Jan 25, 2007 #2
    Draw out a free body diagram for this third charge. Will its location be inbetween the first 2 charges or to one side? Which one will it need to be closer to?
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