SAT Subject Physics Practice Question 428: Answer and Explanation

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Question: 428

4. Two charged objects are moved 50% closer to one another. Which statement about the electric force between the objects is true?

A. The force between them doubles.
B. The force between them halves.
C. The force between them remains the same.
D. The force between them reverses.
E. The force between them operates in the same direction.

Correct Answer: E

Explanation:

The correct answer is (E). The charge on the two does not change, so the force between them MUST operate in the same direction. The magnitude of the force increases by 4.

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