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Failbot
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Homework Statement
A large, thin, non-conducting sheet has a surface charge density of 0.3540 [tex]\mu[/tex]C/m[tex]^{2}[/tex]. Determine the magnitude of the electric field at a distance of 6.40 cm from the sheet.
Homework Equations
Electric Field of Charged Disc
E=[tex]\frac{\sigma}{2e\ =\ 1.602176462(63)\ \times\ 10^{-19}\ C}[/tex](1-[tex]\frac{z}{\sqrt{z^{2}+R^{2}}}[/tex])
Infinite sheet
E=[tex]\frac{\sigma}{2e}[/tex]
The Attempt at a Solution
I have no idea what to do here. I assume I use the infinite sheet equation but how would I use the 6.4 cm to find the field strength there? I feel like maybe I have to use the equation for field strength E=[tex]\frac{kQ}{r^{2}}[/tex] some how but I have no ideas.
Sorry for the sloppy post this is my first post on these boards...Help please.