5.4 Determination of Young's Modulus of a Wire

5.4 Determination of Young's Modulus of a Wire

Experimentally, the magnitude of Young's modulus for a material in the form of wire can be found out mostly with the help of Searle's apparatus as shown in Fig. 5.4.

It consists of two wires, reference wire and test wire of equal lengths of same material having same diameters attached to a rigid support. Both wires are connected to horizontal bars (frames $F_{1}$ and $F_{2}$) at the other ends. Hang a constant weight to the hook of horizontal bar of reference wire and hanger on test wire so that wire remains stretched and free from kinks.