A steel rod has a radius of 20 mm and a length of 2.0 m. A force of 62.8 kN stretches it along its length. Young's modulus of steel is 2.0 × 10^11 N…

A steel rod has a radius of $\displaystyle 20$ mm and a length of $\displaystyle 2.0$ m . A force of $\displaystyle 62.8$ kN stretches it along its length. Young's modulus of steel is $\displaystyle 2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^2$. The longitudinal strain produced in the wire is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^{-5}$