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Math Help - Electric Field of Earth

  1. #1
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    Electric Field of Earth

    need alittle help on this problem.

    in a particular region of the earth's atmosphere, the electric field above the earth's surface has been measured to be 152.5 N/C downward at an altitude of 254 m, and 173.5 N/C downward at an altitude of 420 m. the permitivity of free space is 8.85X10^(-12) C^2/N*m^2.

    neglecting the curvature of the earth, calculate the volume charge density of the atmosphere assuming it to be uniform between 254 m and 420 m. Answer in units of C/m^3.

    any hints?
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  2. #2
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    forget it... question needed answered online and time is up, answers posted with it... thanks for the help
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