A 200 mm long, stress free rod at room temperature is held between two immovable rigid walls. The temperature of the rod is uniformly raised by 250 C. If the Young's modulus and coefficient of thermal expansion are 200 GPa and 1 10-5/ C, respectively, the magnitude of the longitudinal stress (in MPa) developed in the rod is _______

A 200 mm long, stress free rod at room temperature is held between two

1.	A 200 mm long, stress free rod at room temperature is held between two immovable rigid walls. The temperature of the rod is uniformly raised by 250 C. If the Young's modulus and coefficient of thermal expansion are 200 GPa and 1 10^{-5/ C}, respectively, the magnitude of the longitudinal stress (in MPa) developed in the rod is _______
A.	500 MPa
B.	4990 MPa
C.	501 MPa
D.	350 MPa
Answer» B. 4990 MPa

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