If the length and diameter of a wire of circular cross section are both doubled,the resistance is

Name: If the length and diameter of a wire of circular cross section are both doubled,the resistance is
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Quizplus · Accepted Answer

The resistance of a wire is given by R = ρL/A, where ρ is resistivity, L is length, and A is cross-sectional area. Doubling the length doubles L, and doubling the diameter increases A by a factor of four (since A = π(d/2)^2). Thus, the resistance is halved.

If the Length and Diameter of a Wire of Circular