Question

Given that the Young modulus of steel is 210 GPa, the extension of a steel wire undergoing a stress of 300x10⁶ Pa is equal to:

A) 0.14%

B) 1.4%

C) 14%

D) 140%

Answer 1

$$\sigma=\varepsilon E$$

$$\varepsilon =\frac{\sigma}{E}=\frac{300*10^6}{210*10^9}=0.0014=0.14\%$$

Answer: A) 0.14%