SAT Subject Physics Practice Question 69: Answer and Explanation

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Question: 69

6. An object of charge +q feels an electric force FE when placed at a particular location in an electric field, E. Therefore, if an object of charge –2q were placed at the same location where the first charge was, it would feel an electric force of

A.
B. –2FE
C. –2qFE
D.
E.

Correct Answer: B

Explanation:

Since FE (on q) = qE, it must be true that FE (on –2q) = –2qE = –2FE.

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