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A hollow metal sphere has inner and outer radii of 7 cm and 10 cm radii. A point charge is located at the center is located at the center of the sphere. The surface charge density on the inside surface is -300nC/m². The surface charge density on the exterior surface is +300 nC/m². What are the strength and direction of the electric field at points 4, 8, and 12 cm from the center?

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