If a bar is made of copper whose coefficient of linear expansion is one and a half times that of iron, the ratio of force developed in the copper bar to the iron bar of identical lengths and $$cross-sections$$, when heated through the same temperature range (Young$$'s modulus of copper may be taken to the equal to that of $$iron) is

Question

Infinity Learn · Accepted Answer

$$F=Y$$αTA or F∝α  $$($$ ∵YTA is same for both copper and $$iron)$$  or    FC∝αC  and  FI∝αI ∴ $$FCFI=3/21=32$$

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