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In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 140 N/C downward at an altitude of 240 m and 167 N/C downward at an altitude of 390 m. Calculate the volume charge density of the atmosphere, assuming it to be uniform between 240 and 390 m. (Hint: You may neglect the curvature of Earth. Why?)

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