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Questions  

A steel rod of length 1m is heated from 250Cto750C keeping its length constant. The longitudinal strain developed in the rod is (Given : Coefficient of linear expansion of steel =12×106/0C)

a
6×106
b
−6×10−5
c
−6×10−4
d
Zero

detailed solution

Correct option is C

longitudinal strain= α∆T  it is compressive.

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A steel rod of length 5 m is fixed rigidly between two supports. α  of steel  =12×106/oCY=2×1011Nm2  With the increase in its temperature by 400C . the stress developed in the rod is


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