Question

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip$({\alpha }_{copper}>{\alpha }_{steel})$. On heating, this strip will

• A. bend with steel on convex side
• B. get twisted
• C. remain straight
• D. bend with copper on convex side

Answer 1

The correct option is D bend with copper on convex side

Given: ${\alpha }_{copper}>{\alpha }_{steel}$

Increase in length of copper will be greater than steel $({\alpha }_c>{\alpha }_s)$.

Since $\left({\alpha }_c\right)$ is larger so increase in length will be more in this case which will be restricted by steel which results in bending and to accommodate that concavity comes towards steel and convexity on copper side.

Final answer: (b)