AP Physics 1 Question 276: Answer and Explanation

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Question: 276

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

Explanation:

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.