A bimetallic strip is made from identical copper and brass strips. Let α₁ be the coefficient of linear expansion of copper and α₂ that of brass. When the temperature rises by ΔT, the strip bends into an arc of radius R. Then R is:
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Question

A bimetallic strip is made from identical copper and brass strips. Let α₁ be the coefficient of linear expansion of copper and α₂ that of brass. When the temperature rises by ΔT, the strip bends into an arc of radius R. Then R is:

Select all that apply

G1 Physics · Accepted Answer

The curvature of a bimetallic strip is proportional to the differential expansion (α₂−α₁)ΔT. Therefore R is inversely proportional to ΔT and also inversely proportional to |α₂−α₁|. Correct: B,D.