A wire is made by attaching two segments...

A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is `19xx10^(-6)//^(@)C`. The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are `23xx10^(-6).^(@)C` and `12xx10^(-6)//^(@)C`,

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