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A steel rod 10 min in diameter and 1 m long is heated from 200C to 1200C, E = 200 GPa and  

$\alpha$ = 12 x 10-6 per 0C. If the rod is not free to expand the thermal stress developed is

(a) 120 MPa (tensile)                  (b) 240 MPa (tensile)   

(c) 120 MPa (compressive)         (d) 240 MPa(compressive)
 

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