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Two wires, one of copper and other of iron, are of the same length and same radius. Choose correct one.

1. Iron wire has less resistance than copper wire
2. both wires have same resistance
3. Iron wire has more resistance than copper wire
4. none of these

Correct answer: Iron wire has more resistance than copper wire

Solution

Resistance is given by R = ρL/A. Since both wires have the same length and radius, L and A are equal, so the wire with the larger resistivity has the larger resistance. Iron has higher resistivity than copper, so iron’s resistance is greater.

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