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

Linear expansion coefficient of copper is greater than the steel (α_copper > α_steel). So, on heating copper gets more expansion than steel. So the bimetallic strip will bend with the copper on the convex side.

Linear expansion mathematically expressed as

Where,

∆L = change in length

L= original length

α = Linear coefficient of thermal expansion

∆T = change in temperature

Linear expansion coefficient for steel and copper are mentioned in the below table.

Conclusion line missing??