Electric flux from line charge through plane strip

  1. Hey there! :)
    1. The problem statement, all variables and given/known data
    A uniform line charge with linear charge density = 6nC/m is situated coincident with the x-axis. Find the electric flux per unit length of line passing through a plane strip extending in the x direction with edges at y=1, z=0, and y=1, z=5.
    The final answer is 1.31 nC/m. Only problem is I have no idea how to get it.


    2. Relevant equations
    integral of D.ds over a closed surface = electric flux = Q enclosed.


    3. The attempt at a solution
    Attached

    I'm sure the answer is really obvious, but I'm just not seeing it. I attached two solutions, but I actually attempted about 6 other ways, all of which are so pathetically illogical I'd really rather not post them. Anyway any help would be reeeeeeeeally appreciated! And it's not a homework question, so it'd be awesome if you could walk me through it step by step.

    Edit: Do you think this should be in the advanced physics subforum? :S
     

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    Last edited: Nov 9, 2007
  2. jcsd
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