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A wire 3 m is length and 1 mm is diamete...

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`]

A

5.2 mm

B

2.5 mm

C

7.2 mm

D

3.5 mm

Text Solution

Verified by Experts

The correct Answer is:
A
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