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The approximate orientation of an electric field

  1. Feb 25, 2016 #1
    1. The problem statement, all variables and given/known data
    On the image, the left stick has a positive charge and the one of the right has a negative one. (Unirformed charge for each) Give the approximate orientation of the electric fields at the points A, B, C, D by using cardinal orientation.

    http://imgur.com/uWW7JJH
    uWW7JJH.png [Image inserted by moderator]
    2. Relevant equations

    Just adding up electric fields

    3. The attempt at a solution

    A : There are two vectors, one that is pointing towards A by the North/East by going "out" of the positive stick and another one that is pointing towards the negative stick towards the South/East. When we add them we have a field pointing towards the East.

    B: There is a small vector pointing towards the West going out of the positive stick and there is another bigger vector going towards the East from the point B to the the negative stick. Vector addition gives us a vector towards the East.

    C : Same thing, towards the East

    D: One vector is going out of the positive stick and towards D in the south/East. Another is going towards the negative stick from D towards the North/East. We add them and we obtain a vector towards the East.


    To be honest, I'm not sure about C and D. A and D I think I got them right.
     
  2. jcsd
  3. Feb 25, 2016 #2

    TSny

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    Why would the positive stick produce a smaller field at B compared to the negative stick?

    Parts A and D look good.
     
  4. Feb 25, 2016 #3
    You're right, I looked at the problem purely from a geometrical point of view. I finally understood the problem and solved it. Thanks
     
  5. Feb 25, 2016 #4

    TSny

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    Good work!
     
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