Question

When a strip made of iron $\left({\alpha }_1\right)$ and copper ${\alpha }_2(>{\alpha }_1)$ is heated

• A. Its length does not change
• B. It gets twisted
• C. It bends with iron on concave side
• D. It bends with iron on convex side

Answer 1

The correct option is C It bends with iron on concave side

Since the linear expansion coefficient of copper is higher than iron. So when heated, copper will expand more than iron. So the length of copper will become more than iron after heating. Now since they are combined in a strip and have different length, the strip will bend such that iron is on concave side.