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A thin-walled metal spherical shell of radius a = 4 m has a charge qa =...

A thin-walled metal spherical shell of radius a = 4 m has a charge qa = 13 C. Concentric with it is a thin-walled metal spherical shell of radius b = 4a and charge qb = 30 C. Find the electric field at points a distance r from the common center, where (a) r = 1.2 m, (b) r = 8 m, and (c) r = 24.0 m

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