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Question

# There is some change in the length when a 33000 N tensile force is applied on a steel rod of area of cross section 10−3 m2. The change in temperature required to produce the same elongation if the steel rod is heated is (The modulus of elasticity is 3×1011N m−2 and coefficient of linear expansion of steel is 1.1×10−5−1 )

A
20
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B
15
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C
10
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D
0
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Solution

## The correct option is B 10Elongation due to tensile force (F)=3300010−3×3×1011=1.1×10−4Coefficient of linear expansion (α) is 1.1×10−5Change of temperature dT required to produce the same elongation is given by: αdT=1.1×10−4Hence, dT=10o C

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