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Homework Help: Confusion to the solution of a MIT ocw problem

  1. Mar 15, 2014 #1
    1. The problem statement, all variables and given/known data
    My snipping tool is totally broken. So i'm going to leave a link :x
    It's problem 1.6

    2. Relevant equations


    3. The attempt at a solution

    I got everything on the solutions page (http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/assignments/pss1.pdf) But I can't seem to understand why region I of Esheet is positive and Regions II and III are negative. If σ is a negative charge, shouldn't the signs be switched around?
  2. jcsd
  3. Mar 15, 2014 #2
    It's interesting that you have Gauss's Law as one of your equations. When taking a look at the plane, have you thought about it from a flux perspective?
  4. Mar 15, 2014 #3


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    Welcome to PF !

    Here is an image of the problem:


    Attached Files:

  5. Mar 15, 2014 #4

    rude man

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    Post #2 is a good hint, follow it!
    3 equations, 3 unknowns, 3 gaussian surfaces.
    Hint: make sure two of them line up correctly!
  6. Mar 15, 2014 #5
    Thanks! My snipping tool makes it so that the screen turns gray and I snip black images >_<
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