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Problem 8
Each square centimeter of the surface of an infinite plane sheet of paper has  excess electrons. Find the magnitude and direction of the electric field at a point 6.00 cm from the surface of the sheet, if the sheet is large enough to be treated as an infinite plane.
Solution
Electric field due to infinite plane:
Where  . The surface charge density (charge density per square meter) is:
Then the magnitude of electric field is
The direction of electric field is toward the plane (since the plane is negative charged).
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