The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are 8 10^8 ~N ~m ⁻² and 2 10¹¹ ~N ~m ⁻² , is:

Step-by-step solution

In the case for maximum elongation, Stress = Elastic limit aligned _ = _ elastic L Young's modulus = 8 10^8 1 2 10¹¹ & =4 10⁻³ & =4 ~mm aligned i.e. maximum elongation is 4 mm