SAT Subject Physics Practice Question 493: Answer and Explanation

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Question: 493

9. A solid copper sphere has a charge of .2C placed on it. Which of the following statements best describes the charge distribution for the sphere?

A. The charge is equally distributed throughout the entire sphere.
B. The charge is concentrated inside the sphere with some charge on the outside.
C. The charge is equally distributed on the outside surface of the sphere.
D. The charge is equally distributed throughout the inside of the sphere only.
E. The charge is concentrated in the center of the sphere.

Correct Answer: C


The correct answer is (C). The charge on a solid conducting body is found on the outside of the object. The charges distribute themselves equally around the outside of the conducting body because of the mutual repulsion the excess charges have for themselves.

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