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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?

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