Ncert Exercises & Solutions

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

1. remain straight

2. get twisted

3. will bend with aluminium on the concave side

4. will bend with steel on the concave side

(d) Hint: The amount of bending depends on the nature of the material.

Step 1: Find the amount of bending in the two materials.

α_{A l} > α

steal, aluminium will expand more. So, it should have a larger radius of
curvature. Hence, aluminium will be on the convex side.