Question: In the air over a particular region at an altitude of 500 m above the ground the electric field is 120 N/C directed downward. At

In the air over a particular region at an altitude of 500 m above the ground the electric field is 120 N/C directed downward. At 600 m above the ground the electric field is 100 N/C downward. What is the average volume charge density in the layer of air between these two elevations? Is it positive or negative?

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