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An iron bar of length $10 \mathrm{~m}$ is heated from $0^{\circ} \mathrm{C}$ to $100^{\circ} \mathrm{C}$. If the coefficient of linear thermal expansion of iron is $10 \times 10^{-6} /{ }^{\circ} \mathrm{C}$, the increase in the length of bar is
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$1.0 \mathrm{~cm}$
Increase in length $\Delta L=L_0 \propto \Delta \theta$
$=10 \times 10 \times 10^{-6} \times(100-0)=10^{-2} \mathrm{~m}=1 \mathrm{~cm}$
$=10 \times 10 \times 10^{-6} \times(100-0)=10^{-2} \mathrm{~m}=1 \mathrm{~cm}$
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