55. Measurements indicate that there is an electric field
Chapter 16, Problem 55(choose chapter or problem)
55. Measurements indicate that there is an electric field surrounding the Earth. Its magnitude is about 150 N/C at the Earths surface and points inward toward the Earths center. What is the magnitude of the electric charge on the Earth? Is it positive or negative? [Hint: the electric field outside a uniformly charged sphere is the same as if all the charge were concentrated at its center.]
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