Density Flat
8 August 2010
Density Flat
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Surface Charge Density?
An electron close to a large, flat sheet of charge is repelled from the sheet with a 1.4*10^-12 N force. Find the surface charge density on the sheet. Please help not looking for just the answer but the steps to get it. Thanks
electric field NEAR an infinite sheet with surface charge density (σ) is
E = σ/2 eo
eo = permittivity of free space
Foce of reulsion on electron so sheet is negatively charged
E = - σ/2 eo
F = (- e) E = σ*e/2 eo
σ = 2 * eo * F/e
σ = 2 * 8.854*10^-12 *1.4*10^-12/1.6*10^-19
σ = 1.55*10^-4 coulomb/meter^2
