SAT Subject Physics Practice Question 250: Answer and Explanation

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Question: 250

21. If a particle of charge –0.2 mC were placed at a certain location within an electric field, the magnitude of the electric force it would feel is 1 N. What is the magnitude of the electric field at this location? (1 mC = 10–3 C)

A. 2,000 N/C
B. 5,000 N/C
C. 20,000 N/C
D. 50,000 N/C
E. 500,000 N/C

Correct Answer: B

Explanation:

From the equation F = qE, where q is the magnitude of the charge in the electric field, we find that

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