A steel rod of 30 mm diameter and 5 m long is connected to two grips and the rod is maintained at 95°C. Determine the stress induced in the rod when it is cooled to 30°C if E = 2 × 105 MN/m2; α = 12 × 10-6 /°C.
1
180 N/mm2
2
65 N/mm2
3
156 N/mm2
4
165 N/mm2