Show that stress required to double the length of wire (or) to produce 100% longitudinal strain is numerically equal to Young's modulus.

Explanation

`l_1 = l , l_2 = 2l`
`Delta l = 2l - l , Y = ((F/A))/((Delta l)/(l))`
But as `(Delta l)/(l) = 1`, here `F/A = Y`