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The steel wire of cross-sectional area =...

The steel wire of cross-sectional area `=2 mm^2 [Y= 200GPa, alpha= 10^(-5) /.^@C]` is stretched and tied firmly between two rigid supports, at a tempeture `=20^@C`. At this moment, the tension in the wire is 200N. At what temperature will the tension become zero?

A

`70^(@)C`

B

`40^(@)C`

C

`50^(@)C`

D

`30^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
1
`200 =Aalpha DeltaT`
`=2xx10^(-6)xx10^(-5)xx4Txx200xx10^(9)`
`DeltaT=50^(@)C`
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