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The pressure that has to be applied to the ends of a steel wire of length $10\; cm$ to keep its length constant when its temperature is raised by $100^{\circ}$ is (For steel, Young's modulus is $2 \times 10^{11} Nm^{-2}$ and coefficient of thermal expansion is $1.1 \times 10^{-5}K^{-4})$

$\begin{array}{1 1}(A)\;2.2 \times 10^7 \;Pa \\ (B)\;2.2 \times 10^6 \;Pa \\(C)\;2.2 \times 10^8 \;Pa \\(D)\;2.2 \times 10^9 \;Pa \end{array} $

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Coefficient of thermal expansion is $2.2 \times 10^8 \;Pa $
Hence C is the correct answer.
answered Apr 7, 2014 by meena.p

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