Question

If a wire is extended to a new  length l, the work done is

(a) YA(l - l')/l

(b) YA(l - l')²/l

(c) (1/2)YA(l - l')²/l

(d) 2YA(l - l')²/l

Answer 1

Correct option (c) (1/2)YA(l - l')²/l

Explanation :

If the extension is -x, work done in extending by dx