MHT CET 2025 Physics question
The length of steel rod is 5 cm longer than the copper rod at all temperatures. The length of the steel and copper rod is respectively (Coefficient of linear expansion for steel and copper is respectively 1.1 x 10 /C and 1.7 x 10/C)
Answer: (B)
Solution
The difference in lengths stays constant at all temperatures only if both rods expand by the same amount: , so . Hence . With cm:
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