Two identical rectangular strips, one of copper and other of steel, are riveted to form a bimetallic strip.
What will happen on heating them?
Coefficient of Thermal Expansion:
The coefficient of thermal expansion is the property of a material by virtue of which it tends to expand when heating is done. The amount of expansion is different for different materials. The greater amount of thermal expansion will lead to greater expansion.
Answer and Explanation:
The coefficient of thermal expansion for copper is greater than the steel. When the temperature is increased, then the amount of expansion will be greater in the case of copper.
The two identical materials are riveted to form a bimetallic strip. When the temperature increased, the amount of expansion for copper will be greater than the steel. The length of copper will increase, therefore, It will bend the bimetallic strip with copper on the convex side.
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from General Studies Science: Help & ReviewChapter 16 / Lesson 3