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A brass wire 1.8 m long at 27 ^(@) C is ...

A brass wire` 1.8 `m long at `27 ^(@) C` is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of `- 39 ^(@) C`. what is the tension developed in the wire, if its diameter is `2.0` mm ? Co-efficient of tear expansion of brass ` = 2.0 xx 10^(-5) K^(-1)`, Young's modulus of brass = ` 0.91 xx 10^(11)` Pa.

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`3.8 xx 10^(2) N`
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