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 $\alpha_{A1} > \alpha_{steel},$ 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.