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 |
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a) |
3/2 |
b) |
2/3 |
c) |
9/4 |
d) |
4/9 |

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 |
|||||||

a) |
3/2 |
b) |
2/3 |
c) |
9/4 |
d) |
4/9 |

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