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A spherical conductor has a radius R=10cm and a total net charge Q=20C. The electric field at r=20cm from the center of the sphere is

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A spherical conductor has a radius R=10cm and a total net charge Q=20C. The electric field at r=20cm from the center of the sphere is a) 9.0108N/C b) 4.5106N/C c) Zero d) 22.5105N/C

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