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Thermal Expansion

Two metal str...

Question

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

A

Mass

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B

Length

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C

Resistivity

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D

Coefficient of linear expansion

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Solution

The correct option is D
Coefficient of linear expansion

Thermostat is used in electric apparatus like refrigerator, Iron etc for automatic cut off. Therefore for metallic strips to bend on heating their coefficient of linear expansion should be different.

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