SAT Subject Physics Practice Question 70: Answer and Explanation

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Question: 70

7. A charge of –3Q is transferred to a solid metal sphere of radius r. Where will this excess charge reside?

A. –Q at the center, and –2Q on the outer surface
B. –2Q at the center, and –Q on the outer surface
C. –3Q at the center
D. –3Q on the outer surface
E. –Q at the center, –Q in a ring of radius r, and –Q on the outer surface

Correct Answer: D

Explanation:

All excess electric charge on a conductor resides on the outer surface.

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