In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 154 N/C downward at an altitude of 240...

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 154 N/C downward at an altitude of 240 m and 163 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.