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A charge of 8.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm),...

A charge of 8.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of –3.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 10 cm from the center of the two surfaces.

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