On a rainy day of ${20}^{\circ }\mathrm{C}$, the length of a steel track is $20\mathrm{m}$. what will be its length on a hot day with temperature of ${40}^{\circ }\mathrm{C}$ ?

[Coefficient of linear expansion of steel $=1.1\times {10}^6{\mathrm{K}}^{-1}]$

A. $20.009\mathrm{m}$
B. $20.002\mathrm{m}$
C. $20.013\mathrm{m}$
D. $20.004\mathrm{m}$  

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Correct Answer: D