Let AB be the rod and let C be the point at which the weight is hung.
(a) Stress in steel wire = T1/0.1
Stress in brass wire = T2/0.2
As the two stresses are equal,
Taking moments about C,
Equations (i) and (ii) give
(b) Strain = Stress/y = T/Ay
As the strains in both wires are equal,