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A hollow metal sphere has 7cm and 11cm inner and outer radii, respectively. The surface charge density on the inside surface -250nC/m^2 . The surface charge density on the exterior surface is +250 nC/m^2. question (1) What is the strength of the electric field at point 4 cm from the center? question (2) What is the strength of the electric field at point 8 cm from the center?

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