The following data relate to a steel wire on an electric guitar. Diameter $= 5.0 \times 10^{-4}\,\text{m}$ Young modulus $= 2.0 \times 10^{11}\,\text{Pa}$ Tension $= 20\,\text{N}$ The wire breaks and then contracts elastically. Assume that Hooke’s law applies to the wire. By what percentage does the length $l$ of a section of the wire shorten?
- A$1.3 \times 10^{-4}\%$
- B$5.1 \times 10^{-4}\%$
- C$1.3 \times 10^{-2}\%$
- D$5.1 \times 10^{-2}\%$