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Introductory Physics Homework Help
Quick question about which radius to use on Gauss' law problem
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[QUOTE="bluesteels, post: 6576912, member: 694425"] [B]Homework Statement:[/B] A square insulating sheet 80.0 cm on a side is held horizontally. The sheet has 4.50 nC of charge spread uniformly over its area. (a) Estimate the electric field at a point 0.100 mm above the center of the sheet. (b) Estimate the electric field at a point 100 m above the center of the sheet. [B]Relevant Equations:[/B] E= Q/2eA Q= (4.5*10^-9) confused on part A/B when I look up they did E= Q/2e(0.8)^2. But why not use the 0.100mm because that is the area of the enclosed. Same with B why did they use 100m and not 0.8m because 0.8 is smaller so it enclosed the charge [/QUOTE]
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Quick question about which radius to use on Gauss' law problem
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