A steel rod whose diameter is 2 cm and is 2 m long, experiences heating of temperature 30°C to 150°C. The coefficient of thermal expansion is α = 12 × 10-6/°C and Young’s modulus is 200 GPa. If the rod has been restricted to its original position, then the thermal stress (MPa) developed will be ________.

A steel rod whose diameter is 2 cm and is 2 m long, experiences heatin

1.	A steel rod whose diameter is 2 cm and is 2 m long, experiences heating of temperature 30°C to 150°C. The coefficient of thermal expansion is α = 12 × 10-6/°C and Young’s modulus is 200 GPa. If the rod has been restricted to its original position, then the thermal stress (MPa) developed will be ________.
A.	234
B.	256
C.	288
D.	300
Answer» D. 300