A copper wire has a length of $6.4\,\text{m}$ and a resistance of $0.92\,\Omega$. The resistivity of copper is $1.8 \times 10^{-8}\,\Omega\,\text{m}$. What is the wire’s diameter?
- A$5.7 \times 10^{-5}\,\text{m}$
- B$1.0 \times 10^{-4}\,\text{m}$
- C$4.0 \times 10^{-4}\,\text{m}$
- D$7.1 \times 10^{-4}\,\text{m}$