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Homework Help: Finding Electric Field for Three Point Charges

  1. Sep 19, 2011 #1
    1. The problem statement, all variables and given/known data
    The questions are based off of the diagram I attached.
    First, I had to find the strength of the electric field due to each charge at (0 cm, 8 cm).
    Now I need to find the total electric field (both magnitude and direction) at (0 cm, 8 cm) and the total electric potential due to these three charges at the origin (0 cm, 0 cm) and (0 cm, 8 cm).


    2. Relevant equations
    E=[itex]\frac{KeQ}{r^2}[/itex]
    V=[itex]\frac{KeQ}{r}[/itex]
    Ue=qVTOT

    3. The attempt at a solution
    I found the electric fields to be:
    E1= 2742295.52
    E2= 2742295.52
    E3= 8.33333.33

    Now how do I go from here to the total electric field and then total electric potential?
     

    Attached Files:

  2. jcsd
  3. Sep 20, 2011 #2

    ehild

    User Avatar
    Homework Helper

    Remember that the electric field is a vector quantity. Find the direction of the field vectors due to each charge at point (0,8) and add them as vectors.

    ehild
     
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