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Simon Bridge
#4
Mar9-12, 09:37 AM
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Electric Field inside a nonconducting sheet

Your description says the charge is spread uniformly over the faces only - not penetrating into the sheet. So what you have is two parallel 2D sheets of charge.

so put the +Q sheet at z=+5cm and the -Q sheet at z=-5cm and work out the field at z=+3cm.