A light rod with uniform cross-section of 10-4 m2 is shown in the adjoining figure. The rod consists of three different materials whose lengths are 0.1 m, 0.2 m and 0.15 m respectively and whose Young’s modulii are 2 2.5 x 1010 N/m2 , 4 x 1010 N / m2 and 1 x 1010 N/m2 respectively. The displacement of point B will be
(a) 24 x 10-6 m
(b) 9 x 10-6m
(c) 4 x 10-6m
(d) 1 x 10-6 m
