A wire 3 m is length and 1 mm is diameter at 30^(@)C is kept in a low temperature at -170^(@)C and is stretched by hanging a weight of 10 kg at one end. The change in length of the wire is [Take, Y=2xx10^(11) N//m^(2), g=10 m//s^(2) and alpha =1.2 xx 10^(-5) //""^(@)C]
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