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What order of magnitude of resistance is quoted for a metre-long piece of large-diameter copper wire?

A10^3 ohm
B10^5 ohm
C10^-2 ohm
D10^-5 ohm
Answer & Solution
Correct answer: D. 10^-5 ohm
1. Resistances of real objects spread over more than fifteen orders of magnitude. 2. Ceramic insulators used to support power lines sit at 10^12 ohm or more. 3. A dry person measures about 10^5 ohm hand to foot and the human heart about 10^3 ohm. 4. A metre of thick copper wire sits at the far other end of that range, about 10^-5 ohm. 5. That tiny value is why connecting wires in a circuit are normally treated as having negligible resistance. 6. 10^5 ohm is the human body figure, and picking it here is the usual mix-up. _Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Resistance and Simple Circuits_
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