What is the specific resistance of copper?

The specific resistance of copper is commonly known to be approximately 1.68 microohm-meters (µΩ·m) at room temperature. In the context of the choices provided, 10.4 would be interpreted in a different unit or context related to resistivity. This aligns with values that can be found in updated tables of resistivity, which vary based on factors like temperature and purity of the copper. Such variations show how different sources might round or format their values differently.

Understanding the specific resistance of materials is critical for linemen because it directly influences the efficiency of electrical conductors. A lower specific resistance indicates better conductivity, which is why copper is preferred for electrical wiring. Selecting the accurate specific resistance is pivotal in calculations involving current flow, power loss, and heat generation in wiring systems.