10.10 A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250∘C, if the original lengths are at 40.0∘C ? Is there a 'thermal stress' developed at the junction? The ends of the rod are free to expand (Co-efficient of linear expansion of brass =2.0×10−5K−1, steel =1.2×10−5K−1 ).
a.