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A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by
$\left ( \Delta T \right )$. If the thermal coefficient of the material is $\alpha$, young’s modulus is E and the Poisson’s ratio is$\nu$, the thermal stress developed in the cube due to heating is

(a)    $-\frac{\alpha (\Delta T)E}{(1-2\upsilon )}$                               (b)$-\frac{2\alpha (\Delta T)E}{(1-2\upsilon )}$
(c)  $-\frac{3\alpha (\Delta T)E}{(1-2\upsilon )}$                              (d) $-\frac{\alpha (\Delta T)E}{3(1-2\upsilon)}$

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