SAT Subject Physics Practice Question 207: Answer and Explanation

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Question: 207

53. Which of the following would increase the capacitance of a parallel-plate capacitor?

A. Using smaller plates
B. Replacing the dielectric material between the plates with one that has a smaller dielectric constant
C. Decreasing the voltage between the plates
D. Increasing the voltage between the plates
E. Moving the plates closer together

Correct Answer: E


The capacitance of a parallel-plate capacitor is C = Kε0A/d, where K is the dielectric constant, A is the area of each plate, and d is their separation distance. Decreasing d will cause C to increase.

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