If the length and cross-sectional area of a wire are both doubled, its resistance will:

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Resistance (R) of a wire is given by R = ρL/A, where ρ is resistivity, L is length, and A is cross-sectional area. If L becomes 2L and A becomes 2A, the new resistance is R' = ρ(2L)/(2A). The 2s cancel out, leaving R' = ρL/A = R. Thus, the resistance remains entirely unchanged.

If the length and cross-sectional area of a wire are both doubled, its resistance will: MCQ with Answer and Explanation

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