If a copper wire and an iron wire of the same length and area are compared, which is the one with higher resistance?
Iron wire
Resistance R = ρL/A, so for wires of the same length and cross-sectional area the resistance depends only on the resistivity ρ of the material.
Iron has a much higher resistivity (about 10 × 10-8 Ω m) than copper (about 1.7 × 10-8 Ω m).
So the iron wire offers more resistance than the copper wire.
Hence, the answer is Iron wire.
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