A brass rod of length 50 cm and diameter...

A brass rod of length 50 cm and diameter 3.00 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 coefficent of linear expansion of brass ` = 2.0 xx 10^-5 ^@C^-1`, steel ` = 1.2 xx 10^-5 ^@C^-1`).

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