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A steel rod 'L' m long is at a temperature of 'T1'°C, the rod is heated to a temperature 'T2'°C. Let us assume, a temperature rise is denoted by 'T'°C. Derive an expression of the stress induced in a rod, if expansion permitted by supports is '?'. Modulus of elasticity of rod is 'E' and coefficient of thermal expansion is 'a'.
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