SAT Subject Physics Practice Question 75: Answer and Explanation

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Question: 75

2.

Which expresses the value of the electric field at the center of the square?

A. 0
B.
C.
D.
E.

Correct Answer: A

Explanation:

2 A At the center of the square, the electric fields would all cancel. The contribution from the upper-left charge would point away from it, towards the lower-right charge, but the contribution from the lower-right charge would point exactly the opposite direction and cancel it. Likewise, the contributions from the lower-left and upper-right charges would cancel.

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