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What will be the stress at -20^(@)C, if ...

What will be the stress at `-20^(@)`C, if a steel rod with a cross-sectional area of 150 `mm^(2)` is stretched between two fixed points? The tensile load at `20^(@)`C is 5000 N (Assume, `alpha=11.7xx10^(-6)//^(@)C` and Y = `200 xx 10^(11)`N//m^(2)`)

A

`12.7 xx 10^(6)N m^(-2)`

B

`84.2 xx 10^(6)N m^(-2)`

C

`127 xx 10^(6)N m^(-2)`

D

`0.842xx 10^(6)N m^(-2)`

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The correct Answer is:
C
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