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15. A solid conducting steel sphere of radius Rball= 10.0 cm is concentric with a hollow,...

15. A solid conducting steel sphere of radius Rball= 10.0 cm is concentric with a hollow, uniformly charged, nonconducting spherical shell of plastic with an inner radius Rinner = 20.0 cm and outer radius Router = 30.0 cm. The steel sphere has net charge qball = 40.0 nC, while the spherical shell has net charge qshell = -50.0 nC. Determine the magnitude of the electric field at the following distances from the center:(a) r = 5.00 cm. (b) r = 15.0 cm. (c) r = 25.0 cm.

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