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A stell wire of 1m long `1mm^(2)` cross section area is hang from rigid end. The length of 1kg is hung from it then change in length will be (given `Y = 2 xx 10^(11) N//m^(2)`)
A. 0.5 mm
B. 0.25 mm
C. 0.05 mm
D. 5 mm

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