1.

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`

Answer» Correct Answer - 1
`200 =Aalpha DeltaT`
`=2xx10^(-6)xx10^(-5)xx4Txx200xx10^(9)`
`DeltaT=50^(@)C`


Discussion

No Comment Found

Related InterviewSolutions