A rod of length 2 m rests on a smooth horizo | vedclass

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(C) Longitudinal strain is defined as the ratio of change in length to the original length,which occurs only when the thermal expansion is restricted

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$0$

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(C) Longitudinal strain is defined as the ratio of change in length to the original length,which occurs only when the thermal expansion is restricted or opposed by external forces.Since the rod is placed on a smooth horizontal floor,there is no friction or external constraint to oppose its expansion.As the rod is free to expand,the change in length occurs without any internal stress.Therefore,the longitudinal strain developed in the rod is $0$.

$A$ rod of length $2 \ m$ rests on a smooth horizontal floor. If the rod is heated from $0^\circ C$ to $20^\circ C$,find the longitudinal strain developed? $(\alpha = 5 \times 10^{-5} / ^\circ C)$

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