It has been experimentally observed that the electric field in a large region of earth's atmosphere is directed verti- cally down. At an altitude of 300 m, the electric field is 60 Vm-¹. At an altitude of 200 m, the field is 100 Vm-1. Calculate the net amount of charge contained in the cube of 100 m edge, located between 200 and 300 m altitude. E₁ = 60 Vm-1 E₂ = 100 Vm-1 Fig ds E dS K 300 m 平 200 m
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