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Electrostatics about -flux

  1. Jun 15, 2016 #1
    1. The problem statement, all variables and given/known data
    two infinitely large plates are at a distance d from each other .they carry a unifor surface charge of densities X and -X.the plates have round coaxial holes of radius R.with d<<R.find the electric field through the axis of the holes(taking them as circles) as a function of distance l from them.



    2. Relevant equations


    3. The attempt at a solution
    i think i should find the field due to both the plates and subtaract the field due to the hole.i dont exactly know how to do that if that's how it done.
     
  2. jcsd
  3. Jun 15, 2016 #2
    Ok then. Show what you get for the field of the plates (without hole).
    Then show what you get for the hole. Since you are on axis, you only need to consider one component of the field. What can you say about the direction of the field? Just do an integration over the surfaces of the holes, summing over the nonzero component.
     
  4. Jun 15, 2016 #3
    ok but what do i integrate from where to where?if i take a small area of width dx and at a distance dr from tthe center .the answer is pretty confusing
     
  5. Jun 15, 2016 #4
    Integrate over the surface area of the circle. Thanks to symmetry, you can do this as a 1D integral.
     
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