Bimetals

Bimetal refers to an object that is composed of two separate metals joined together. Instead of being a mixture of two or more metals, like alloys, bimetallic objects consist of layers of different metals. The above left diagram [A] shows a bimetal consisting of two metals \(X\) and \(Y\) being heated up. The above right diagram [B] shows a bimetal consisting of two metals \(Z\) and \(W\) being cooled down. Now, the linear expansion coefficients of iron, copper and aluminium are \(12 \times 10^{-6} \text{ /K}\), \(16 \times 10^{-6} \text{ /K}\) and \(23 \times 10^{-6} \text{ /K}\), respectively. Which of the following combinations will bend the bimetals upwards (resulting in the right ends lifted up as in the diagram)?

a) X=iron, Y=copper in the bimetal [A].

b) X=aluminium, Y=iron in the bimetal [A].

c) Z=aluminium, W=copper in the bimetal [B].

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