SAT Subject Physics Practice Question 71: Answer and Explanation

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Question: 71

8. Which of the following statements is true?

A. Electric field vectors point toward a positive source charge, and the resulting electric force on an electron would point in the same direction as the electric field vector.
B. Electric field vectors point toward a positive source charge, and the resulting electric force on an electron would point in the opposite direction from the electric field vector.
C. Electric field vectors point toward a negative source charge, and the resulting electric force on an electron would point in the same direction as the electric field vector.
D. Electric field vectors point toward a negative source charge, and the resulting electric force on an electron would point in the opposite direction from the electric field vector.
E. None of the above

Correct Answer: D

Explanation:

By definition, electric field vectors point away from a positive source charge and toward a negative source charge. Furthermore, since an electron (which is negatively charged) would be repelled from a negative source charge, the resulting electric force on an electron would point away from a negative source charge, in the opposite direction from the electric field vector.

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