When the length of a wire is doubled while keeping material and area of cross-section constant, what happens to its resistance?
The resistance becomes twice as much
The resistance of a wire is R = ρL/A, where ρ is resistivity, L is length and A is area of cross-section.
If L is doubled and ρ and A stay the same, R also doubles.
Hence, the answer is The resistance becomes twice as much.
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