# A steel rod of length 1 m and area of cross-section 1 cm2 is heated from to without being allowed to extend or bend. What is the tension produced in the rod?

$L_t = L (1 + \alpha \Delta t)$

$\Delta L = 1 \times 10^{-5 }\times 200$

$Y = 2 \times 10^{11 }N/m^{2}$

$F = 2 \times 10^{11} \times 10^{-5} \times 200 \times \frac{0.0001}{1} = 4 \times 10^{4} N$

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