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Electric field strength between charged plates

  1. Jul 31, 2017 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2017-07-31 at 6.50.30 pm.png

    2. Relevant equations


    3. The attempt at a solution
    E=kq/r2
    so when the distance increase E should decrease?
    I know this is wrong, but can someone explain why? Thanks
     
  2. jcsd
  3. Jul 31, 2017 #2

    haruspex

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    Have you tried sketching the field lines?
     
  4. Jul 31, 2017 #3
    field lines are from + to negative. vertical.
     
  5. Jul 31, 2017 #4
    The field strength is equal to the density of the field lines, what can you say about that if all the field lines are vertical?
     
  6. Aug 1, 2017 #5

    rude man

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    Have you covered gaussian surfaces in electrostatics yet?
     
  7. Aug 1, 2017 #6
    Cici the field at any point depends, amongst other things, on the geometry of the system. The equation you used gives the field due to an isolated point charge. And yes,this particular field does weaken with distance. The field for other geometries is different so for your parallel plates take the advice given above.
     
  8. Aug 1, 2017 #7
    I think I have got it. Thank you!
     
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