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10-1.Thermometry, Thermal Expansion and Calorimetry
normal
If a bimetallic strip is heated it will
A
Bend towards the metal with lower thermal expansion coefficient.
B
Bend towards the metal with higher thermal expansion coefficient.
C
Not bend at all
D
Twist itself into a helix
Solution
When a material is heated, it expands in length by an amount equal to $\alpha \Delta T$, where $\alpha$ is the coefficient of linear thermal expansion and $\Delta T$ is the change in temperature.
The metal which expands the most will therefore be the one which has the largest coefficient of linear thermal expansion. a bimetallic strip is heated it will bend towards the metal with lower thermal expansion coefficient.
Standard 11
Physics