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  • A steel rod of diameter  is clamped firmly at each end when its temperature is <img a

A steel rod of diameter 1 \mathrm{~cm} is clamped firmly at each end when its temperature is 25^{\circ} \mathrm{C}, so that it cant contract on coaling. The tension in the road at 0^{\circ} \mathrm{C} is approximately. (Take, \alpha=10^{-5} 1^{\circ} \mathrm{c}, y=2 \times 10^{11} \mathrm{~N} / \mathrm{m}^2 )

Option: 1

4000 \mathrm{~N}


Option: 2

7000 \mathrm{~N}


Option: 3

7400 \mathrm{~N}


Option: 4

4700\mathrm{~N}


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