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How to sum charges?

  1. Sep 15, 2010 #1

    somasimple

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    1. The problem statement, all variables and given/known data
    Attached figure.
    3 charges : q1, q2 and q3 are on a plane (for simplification).
    We want to compute the resulting charge at some point of the plane.
    1/ Is it possible to sum (for computation) these charges to an arbitrary point A?
    2/ or B?

    2. Relevant equations
    these ones ?
    http://www.ux1.eiu.edu/~cfadd/1160/Ch17/Vector.html
    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/mulpoi.html

    3. The attempt at a solution
    I supposse I can't do it directly. I may use force or voltage or electric field?
     

    Attached Files:

  2. jcsd
  3. Sep 15, 2010 #2

    Office_Shredder

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    I'm not sure what you're looking for. The charge at point A is zero, because there is no charge there.
     
  4. Sep 15, 2010 #3

    somasimple

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    I want to combine the 3 charges at point A or B.
    I know that is possible to compute the voltage V=kq1/r1...
    I'm interested in the result charge (virtual).
     
  5. Sep 15, 2010 #4

    Pengwuino

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    You can determine the potential or electric field at the point A, but you can't just reform the problem and just place a charge at an arbitrary point.
     
  6. Sep 15, 2010 #5

    somasimple

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    OK thanks but is it possible to compute the potential or EF at B (since distance becomes null)?
     
  7. Sep 15, 2010 #6
    Well, if B is a point inside the sphere, and if the said sphere is hollow, then you can find the electric field I think....of course, the field will be zero inside the shell if its conducting.
     
  8. Sep 16, 2010 #7

    somasimple

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    Thanks.
     
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