Question

22. A wire of length l, area of cross-section A and
weight w is subjected to external force 2w. If Y is
Young's modulus, then total extension in wire is​

Answer 1

Explanation:

stress = load/cross sectional area

= 2w/A

strain = change in length/original length

= ∆l/ l

young's modulus = stress/strain

Y= (2w/A)/(∆l/ l)

the total extension in wire is nothing but change in length of wire i.e ∆l

∆l = 2w*l/(A*Y)