(Answered) A solid sphere of radius r is made of a metallic conductor

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A solid sphere of radius R is made of a metallic conductor. A hollow spherical shell of the same radius R is made of the same conducting material. An excess charge Q is deposited on each.

1) Which object has the greatest surface charge density?

2) Briefly explain your answer to the previous question.

3) A solid sphere of radius R is made of a metallic conductor. Another solid sphere of radius R is made of an insulating material. An excess charge Q is deposited on each. Which object has the greatest surface charge density?

4) Explain your answer to the previous question.

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