A thin circular sheet of glass of diameter 7 meters is rubbed with a cloth on one surface, and becomes charged uniformly. a chloride ion (a chlorine atom which has gained one extra electron) passes near the glass sheet. when the chloride ion is near the center of the sheet, at a location 0.7 mm from the sheet, it experiences an electric force of 4e-15 n, toward the glass sheet. in this problem, use the value ε0 = 8.85e-12 c2/(n·m2)
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