Linear expansion coefficient of copper is greater than the steel (αcopper > αsteel). 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
∆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.
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The density of waHC Verma - Concepts of Physics Part 2