In fig.1.21 load-elongation of two wires made of two different materials A and B are shown. The wires have the same length and the same area of cross section. Which material has a greater value of Y?

In fig.1.21 load-elongation of two wires made of two different materia

1.	In fig.1.21 load-elongation of two wires made of two different materials A and B are shown. The wires have the same length and the same area of cross section. Which material has a greater value of Y?
Answer» SOLUTION :For the same load F, ELONGATIONS in the wires made of MATERIALS A and B are `l_1` and `l_2` respectively [Fig.1.21] Since their initial LENGTHS are the same, `(longitudi nal strai n)_Alt(longitu d i nal STRA i n)_B`. Now, `Y=(longitudi nal stress)/(longitudi nal strai n)` Hence, `Y_A gt Y_B`.