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

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`? The ends of the rod are free to expand (coefficient of linear expansion of brass `=2.0 times 10^(-5)K^(-1)`, steel `=1.2 times 10^(-5)K^(-1)`).

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0.34 cm
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