Two identical rectangular strips- one of copper and the other of steel- are riveted together to form a bimetallic strip -copper -steel - On heating- this strip willa remain straightb bend with copper on convex sidec bend with steel on convex sided get twisted

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Standard XII

Physics

Emissive and Absorptive Power

Two identical...

Question

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip (α_copper > α_steel). 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

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Solution

(b) bend with copper on convex side

We are provided with two metal strips of copper and steel. On heating, both of them will expand. Expansion coefficient of copper is more than that of steel. So, the copper metal strip will expand more, causing the bimetallic strip to bend with copper at the convex side, as it'll have more surface area compared to the steel sheet, which will be on the concave side.

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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

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip (α_copper > α_steel). 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