A 30 m long rail is prevented from exapnsion at either end. if the temp. is raised by 30 deg. C. What stress will be induced in the rail if the coefficient of linear expansion is 12 x 10 ^ 6 / deg.C ,take E = 200 MPa
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Gap left = Change in length on heating
Gap=Initial length×Coefficient of linear expansion×change in temperature
Gap=10×0.000012×15m
⟹Gap=0.0018 m
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