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A steel rod of length L and diameter D, fixed at both ends, is uniformly heated to a temperature
rise of $\left ( \Delta \right )$T. The Young’s modulus is E and the coefficient of linear expansion is ‘$\alpha$’. The thermal
stress in the rod is

(a) 0                             (b) $\alpha \Delta$T
(c) E$\alpha \Delta$ t                (d) E $\alpha  \Delta$ TL

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