AP Physics 1 Question 276: Answer and Explanation
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3. Which of the following would be most effective at decreasing the resistance of a metal resistor?
- A. Increasing the length
- B. Increasing the cross-sectional area
- C. Using a material of greater density
- D. Using glass instead of metal
Correct Answer: B
The formula for calculating resistance is
R = ρL/A
Because resistance is inversely proportional to the cross-sectional area, (B) is correct. Choices (A) and (D) would have the opposite effect, and (C) is incorrect because density and resistance do not have any correlation.