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A bimetallic strip consists of metals $X$ and $Y$. It is mounted rigidly at the base as shown. The metal $X$ has a higher coefficient of expansion compared to that for metal $Y$. When the bimetallic strip is placed in a cold bath
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it will bend towards the left
When the bimetallic strip is kept in a cold bath, the length of $X$ decreases faster and therefore the strip binds towards the left.
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