If a bimetallic strip is heated,it will:

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(A) When a material is heated,it expands in length by an amount proportional to $\alpha \Delta T$,where $\alpha$ is the coefficient of linear thermal

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Bend towards the metal with lower thermal expansion coefficient.

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(A) When a material is heated,it expands in length by an amount proportional to $\alpha \Delta T$,where $\alpha$ is the coefficient of linear thermal expansion and $\Delta T$ is the change in temperature.The metal with the higher coefficient of linear thermal expansion $(\alpha)$ will expand more than the metal with the lower coefficient for the same temperature change.Because the two metals are bonded together,the one that expands more will form the outer arc of the curve,while the one that expands less will form the inner arc.Therefore,the bimetallic strip will bend towards the metal with the lower thermal expansion coefficient.

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