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A point charge of −3.00 μC is located in the center of a spherical cavity of radius 6.50 cm that, in turn, is at the center of an insulating charged solid sphere. The charge density in the solid is ρ = 7.35 × 10−4 C/m3. Calculate the electric field inside the solid at a distance of 9.50 cm from the center of the cavity.
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