The resistivity of a 0.4 m length of 1mm diameter copper wire at 0°C, is the same as the resistivity of a 0.8 m length of 1mm diameter copper wire at 0°C.
Electrical resistivity is a property of a material that measures the ability of the material to resists electric current.
The SI unit of resistivity is the ohm-meter. The resistivity of the same material is constant irrespective its size.
The resistivity of a 0.4 m length of 1mm diameter copper wire at 0°C, is the same as the resistivity of a 0.8 m length of 1mm diameter copper wire at 0°C.
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