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