**Which of the following materials is the best electrical conductor?**

**A. Aluminum resistivity= 4.6E-8**

**B. Brass resistivity=7.0E-8**

**C. Copper resistivity=1.8E-8**

**D. Nichrome resistivity=105E-8**

**Answer:** **C.**

Resistance = ρL/A, where ρ is the resisitivity, L the length, and A the area of cross section of the conductior.

So, if we consider L/A to be the same for all conductors,

the conductor with lower ρ will have a lower resistance, and hence will be the better conductor.

So, Copper with the lowest resistivity is the best conductor.