JEE Main 2022 Physics question
A unit scale is to be prepared whose length does not change with temperature and remains 20 cm, using a bimetallic strip made of brass and iron each of different length. The length of both components would change in such a way that difference between their lengths remains constant. If length of brass is 40 cm and length of iron will be cm. ( and ).
Answer: 60
Solution
The difference in lengths stays constant when , i.e. L_{1}$Δ T = α
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