Question: a hollow metal sphere has 6 cm and 10cm inner and outer radii?
Answer: A hollow metal sphere has inner and outer radii of 6 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 -100nC/m2. The surface charge density on the exterior surface is +100 nC/m2.