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Two metal strips that constitute a therm...

Two metal strips that constitute a thermostat must necessarly differ in their

A

mass

B

length

C

resistivity

D

coefficient of linear expansion

Text Solution

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The correct Answer is:
To solve the question about the two metal strips that constitute a thermostat, we need to analyze the properties that are essential for their function. ### Step-by-Step Solution: 1. **Understanding the Function of a Thermostat**: - A thermostat is a device that regulates temperature by using metal strips that bend in response to temperature changes. 2. **Identifying the Relevant Properties of Metal Strips**: - The metal strips must have properties that allow them to respond differently to temperature changes. 3. **Analyzing the Given Options**: - **Mass**: The mass of the strips does not affect their bending behavior in response to temperature changes. - **Length**: The length of the strips can be the same, and it does not determine how they will bend. - **Resistivity**: While resistivity is a property of materials, it does not play a role in the bending mechanism of the strips. - **Coefficient of Linear Expansion**: This is the key property that determines how much a material expands or contracts with temperature changes. For the strips to bend in different directions, they must have different coefficients of linear expansion. 4. **Conclusion**: - The two metal strips must necessarily differ in their coefficient of linear expansion to function effectively as a thermostat. Thus, the correct answer is **coefficient of linear expansion**. ### Final Answer: The two metal strips that constitute a thermostat must necessarily differ in their **coefficient of linear expansion**. ---
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