A copper wire is $1.7\text{ m}$ long and has a uniform diameter of $0.64\text{ mm}$. The Young modulus of copper is $1.2 \times 10^{11}\text{ Pa}$. What is the spring constant of the wire?
- A$2.3 \times 10^{4}\text{ N m}^{-1}$
- B$9.1 \times 10^{4}\text{ N m}^{-1}$
- C$4.5 \times 10^{7}\text{ N m}^{-1}$
- D$7.1 \times 10^{7}\text{ N m}^{-1}$