Physics Help Forum Electric field around a plane sheet

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 Jul 15th 2015, 09:55 PM #1 Junior Member   Join Date: Jun 2015 Location: india Posts: 27 Electric field around a plane sheet Electric field around a plane sheet is given by s/e where 's' is surface charge density and 'e' is permitivity of medium . This implies that electric field is uniform around a plane sheet that is no variation even with diatance . So my question is how long this will be present will it spread till infinity.
 Jul 16th 2015, 01:30 PM #2 Senior Member   Join Date: Nov 2013 Location: New Zealand Posts: 552 An infinite sheet? I think on a finite sheet the electric field start to point outwards (left or right) at the edges. I saw a youtube video of this. Might try to dig it up.
 Jul 20th 2015, 07:31 AM #3 Junior Member   Join Date: Jun 2015 Location: india Posts: 27 I meant a practically infinite sheet
Jul 20th 2015, 03:00 PM   #4
Senior Member

Join Date: Apr 2015
Location: Somerset, England
Posts: 1,035
 I meant a practically infinite sheet
Yes the field is constant for any distance small compared to the size of the plane.

The field for smaller planes can also be calculated (with greater difficulty) by applying suitable limits of integration.
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 Jul 21st 2015, 10:31 PM #5 Junior Member   Join Date: Jun 2015 Location: india Posts: 27 But how will be the boundary of this elecrtic field . Will it be at finite distance or at infinity
 Jul 22nd 2015, 12:13 AM #6 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 1,035 An electric field has no boundary unless it is blocked by something. Kiwiheretic was correct in his first response. Everything else said is consistent with this. I have given you the conditions where your original statement is correct. That is the field is only constant out to infinity for an infinite sheet. That is one of the strange things about infinity.

 Tags electric, electric fied, field, plane, sheet

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