A rod is fixed between two points at 20∘. The coefficient of linear expansion of material of rod is 1.1×10−5∘C and Young's modulus is 1.2×1011Nm2. Find the stress developed in the rod if temperature of rod becomes 10∘C
A
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B
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C
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D
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Solution
The correct option is A Thermal stress FA=YαΔθ=1.2×1011×1.1×10−5×(20−10)=1.32×107Nm2