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Find the flux through a surface S (Electromagnetic Theory)

  1. Sep 12, 2011 #1
    1. The problem statement, all variables and given/known data
    A point charge q1 is located on the y-axis at r1= a (Y_hat) and another q2 located at the mirror point r2= -a (Y_hat). The charges are not necessarily the same sign or magnitude. Now consider the circular surface S of radius a contained in the x-z plane through the origin. Take the normal vector to this surface to point along the positive y-axis.

    a.) Find the flux of the electric field through S.
    b.) Use Mathematica to plot the field lines in the y-z plane through the origin for the following three cases: q2=-10q1, q2=q1, and q2=10q1.


    2. Relevant equations

    I have no idea how to start this problem or how to plug it into mathematica

    3. The attempt at a solution
     
  2. jcsd
  3. Sep 12, 2011 #2

    vela

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    You need to show some effort at trying to solve the problem yourself before receiving help. This is pretty basic stuff. What's the field of a point charge? What's the definition of flux?
     
  4. Sep 12, 2011 #3
    Flux= EA cos(theta)= E.A
    I got flux = q/4e0

    I don't have experience using mathematica at all
     
  5. Sep 12, 2011 #4
    Sorry for that. This one. I think I may have over thought it a bit.
     
  6. Sep 12, 2011 #5

    vela

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    That only works for a constant electric field.
    How did you get this? What's q? The original problem has q1 and q2.
     
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