SAT Subject Physics Practice Question 367: Answer and Explanation

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Question: 367

63. Two similar pith balls are very near to one another, and each is charged with 2 excess electrons. The angle q between q1 and q2 is 5.5°. One electron is removed from q1 and placed on q2 so that q1 has 1 electron and q2 has 3 electrons. The angle between the pith balls changes to 4°. Which of the following statements is correct?

I.The amount of electrostatic charge has decreased.

II.The electrostatic force between the pith balls has decreased.

III.Both the electrostatic charge and force have decreased.

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

Correct Answer: B

Explanation:

The correct answer is (B). The same number of charged bodies are still in the system, however, the redistribution of the charge has reduced the force the pith balls exert on one another.

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