A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If α = 0.000012/C°, = 0.2 MN/mm, the tensile force developed at a temperature of 50°C, is

A steel rod of sectional area 250 sq. mm connects two parallel walls 5

1.	A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If α = 0.000012/C°, = 0.2 MN/mm, the tensile force developed at a temperature of 50°C, is
A.	80 N/mm
B.	100 N/mm
C.	120 N/mm
D.	150 N/mm
Answer» D. 150 N/mm

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A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If α = 0.000012/C°, = 0.2 MN/mm, the tensile force developed at a temperature of 50°C, is

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