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We would like to prepare a scale whose length does not change with temperature. It is proposed to prepare a unit scale of this type whose length remains, say 10 cm. We can use a bimetallic strip made of brass and iron each of different length whose length (both components) would change in such a way that difference between their lengths remain constant. If αiron = 1.2 x 10-5 / K and αbrass = 1.8 x 10-5 / K, what should we take as length of each strip?

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Take as length of each strip

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