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Electric Field at a point inside 2 semi circles

  1. Oct 15, 2013 #1
    1. The problem statement, all variables and given/known data

    I have this picture http://i.imgur.com/ek2N1dL.png
    I have to find the electric field at the point inside 2 semi circles. The left semi circle has a charge of -3 micro Coulombs and the right one has +3 micro coulombs. The radius between the point and the circle is 0.2 meters.

    2. Relevant equations

    Electric field = ∫kdq/r2

    3. The attempt at a solution

    I know what the FBD looks like and how to solve a problem for one semi circle alone but adding that other piece is really throwing me off. What should I keep in mind when solving this?
  2. jcsd
  3. Oct 15, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Use superposition. Find the field from each semicircle, then just add them up.
  4. Oct 15, 2013 #3
    Well, I'm really doubting myself here. I would want to say 0... but wouldn't that be only if they were both positive or both negative...?
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