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Two identical rectangular strips one of ...

Two identical rectangular strips one of copper and the other of steel, are riveted toghter to form a compound bar. What will happen on heating ?

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When two dissimilar metals say copper and steel are riveted together that arrangement is called " bimetallic strip" .
When a bimetallic strip is heated copper strip will expand more then steel due to more expansion coefficient .

Since they riveted they must expand as a common piece. As a result bimetallic strip will bend in the form of an arc. For the metallic trip with high ` alpha` its length is more so it is on the outer side . For the strip with less `alpha` its length is less . It will be at the inner side of the arc .
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