Question

A bimetallic strip is made of aluminium and steel $\left(\alpha_{Al} > \alpha_{steel}\right)$. On heating, the strip will

• A. remain straight
• B. get twisted
• C. will bend with aluminium on concave side
• D. will bend with steel on concave side

Answer 1

Answer: (D)

will bend with steel on concave side

Answer 2

Since $\alpha_{Al} > \alpha_{steel}$, so on heating the bimetallic strip, aluminium strip will expand more than that of steel strip. Due to it, steel strip will bend on concave side.