JEE Main Physics question
If a bar is made of copper whose coefficient of linear expansion is one and a half times that of iron, the ratio of the force developed in the copper bar to the iron bar of identical lengths and cross-sections, when heated through the same temperature range (Young's modulus for copper may be taken equal to that of iron) is
Answer: (A)
Solution
Thermal stress force (for a constrained bar) . With equal
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