Question

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip (αcopper > αsteel). On heating, this strip will
(a) remain straight
(b) bend with copper on convex side
(c) bend with steel on convex side
(d) get twisted

Answer 1

(b) bend with copper on convex side

Explanation:

• If you are provided with two metal strips of copper and steel, and upon heating, you will see both the metals expanding.

• The Expansion coefficient of steel is lesser than that of copper. Hence, the expansion of the copper metal strip will be more, thereby the bending of the bimetallic strip with copper is caused at the convex side.

• This is because of the surface area which is more when compared to the steel sheet that will be on the concave side.