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A steel wire is 4.0 m long and 2 mm in d...

A steel wire is 4.0 m long and 2 mm in diameter. Young’s modulus of steel is `1.96 xx 10^(11) N//m^(2)`. If a mass of 20 kg is suspended from it the elongation produced will be-

A

2.54 mm

B

1.27 mm

C

0.64 mm

D

0.27 mm

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