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Homework Help: Electric Field between two positivly chared surfaces

  1. Jan 21, 2008 #1
    1. The problem statement, all variables and given/known data
    Figure 24-34 shows cross-sections through two large, parallel, nonconducting sheets with identical distributions of positive charge with surface charge density σ = 2.62 x 10-22 C/m2. What is the y component of the electric field at points (a) above the sheets, (b) between them, and (c) below them?
    http://edugen.wiley.com/edugen/courses/crs1141/art/qb/qu/c24/Fig23_38.gif


    2. Relevant equations
    E=[tex]\sigma[/tex]/[tex]\epsilon[/tex]


    3. The attempt at a solution
    my question is how would u find the y component as when using the equation you get E? would you use trig or is there another way?
     
  2. jcsd
  3. Jan 21, 2008 #2

    Dick

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    There is ONLY a y component from each plate, isn't there? Just ask yourself in each region whether the E fields add or subtract. No trig needed.
     
  4. Jan 21, 2008 #3
    ic...just one quick question, does the rule for cylinders apply for this question so that the center has a net electric field of 0?
     
  5. Jan 21, 2008 #4

    Dick

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    Compute the E fields on each side, consider direction and add them. There is no automatic rule telling you that the E field in the middle is zero.
     
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