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Homework Help: Electric Field of an n sided polygon

  1. Oct 13, 2005 #1


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    We have an n sided polygon, each side is length 2L and R is the distance from the center of the polygon to the mid-point of any side. We know, L=Rtan(pi/n).

    I need: "the E-field on the axis of the polygon at a point distance h above it"

    When n goes to infinity, we should get the same E-field as a uniform ring charge:
    E= kQh/(h^2+R^2)^1.5

    any help would be awesome, thx :)
  2. jcsd
  3. Oct 14, 2005 #2


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    And, what have you done so far to solve the problem?
  4. Oct 14, 2005 #3
    Simple: do we have any symmetry here? Find the field to a single side (a finite line segment).

    Hope this helps.
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