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Old Jul 15th 2015, 09:55 PM   #1
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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.
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Old Jul 16th 2015, 01:30 PM   #2
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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.
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Old Jul 20th 2015, 07:31 AM   #3
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I meant a practically infinite sheet
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Old Jul 20th 2015, 03:00 PM   #4
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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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Electric field around a plane sheet-planefield1.jpg   Electric field around a plane sheet-planefield2.jpg  
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Old Jul 21st 2015, 10:31 PM   #5
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But how will be the boundary of this elecrtic field . Will it be at finite distance or at infinity
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Old Jul 22nd 2015, 12:13 AM   #6
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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.
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