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Homework Help: Electric field and the Earth

  1. Feb 9, 2005 #1
    So, Measurements indicate that there is an electric field surrounding the Earth. Its magnitude is about 150 N/C at the Earth's surface and poitns inward toward the Earth's center. What is the magnitude of the electric charge on the Earth? Is it positive or negative?

    I got the answer, but is it negative or positive?
  2. jcsd
  3. Feb 9, 2005 #2
    If the vector [tex]\vec{E}[/tex] is pointing toward the center then the charge is negative.
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