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

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Correct option is D

Thermostat works on the principle of operation of a limit switch. Here a bimetallic strip, made of dissimilar metals having different when heated bends and touches the lever of a limit switch making it on or off. The metals used for making the bimetallic strip must have different coefficient of thermal

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Two thin metal strips each of 2mm thick, one of brass and the other of iron are fastened together parallel to each other, to form a bimetallic strip. If the strips are of equal length at 0°c . The radius of the arc formed by the bimetallic strip when heated to C is (Coefficient of linear expansion of brass = $19 \times 10^{- 6} /^{\circ} C$ and of iron = $12 \times 10^{- 6} /^{\circ} C$ )