An iron bar of length \( l \) and having a cross-section \( A \) is heated from 0 to \( 100^{\ci...

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An iron bar of length \( l \) and having a cross-section \( A \) is heated from 0 to \( 100^{\circ} \mathrm{C} \). If this bar is so held that it is not permitted to expand or bend, the force that is developed, is
[RPMT 2005]
(a) Inversely proportional to the cross-sectional area of the bar
(b) Independent of the length of the bar
(c) Inversely proportional to the length of the bar
(d) Directly proportional to the length of the bar
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