Resistivity of Copper

The resistivity of a material is a measure of its ability to resist the flow of electric current. It is denoted by the symbol ρ and is measured in ohm-meters (Ω·m). Copper is known for its excellent electrical conductivity, and therefore it has a low resistivity compared to many other materials.

Factors affecting resistivity

The resistivity of a material depends on several factors, including temperature, impurities, and crystal structure. In the case of copper, the resistivity is primarily influenced by impurities and crystal defects.

Resistivity of Copper

The resistivity of copper at room temperature (25°C or 298K) is approximately 1.59 x 10^-8 ohm-m. This value is commonly used in electrical engineering calculations.

Comparison with other options

To determine the correct answer, let's compare the given options:

a) 1.59 x 10^-8 ohm-m (Correct Answer)
b) 2.7 x 10^-8 ohm-m
c) 7.3 x 10^-8 ohm-m
d) 5.35 x 10^-8 ohm-m

As we can see, option 'A' matches the known value for the resistivity of copper, while the other options are different. Therefore, the correct answer is option 'A'.

Conclusion

In summary, the resistivity of copper is approximately 1.59 x 10^-8 ohm-m. Copper is widely used in electrical and electronic applications due to its low resistivity and high conductivity. Understanding the resistivity of materials is crucial in designing and analyzing electrical circuits and systems.