Question
A steel rod of length 1 m rests on a smooth horizontal base. If it is heated from $0^{\circ} \mathrm{C}$ to $100^{\circ} \mathrm{C}$, what is the longitudinal strain developed?
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Answer
$\Delta\text{L}=100^\circ\text{C}$A longitudinal strain develops if and only if, there is an opposition to the expansion.
Since there is no opposition in this case, hence the longitudinal stain here = Zero.
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