Overall changes in volume and radii of a uniform cylindrical steel wire are 0.2% and 0.002% respectively when subjected to some suitable force. Longitudinal tensile stress acting on the wire is (Y=2.0×1011Nm−2)
A
3.2×109Nm−2
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B
3.2×107Nm−2
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C
0.392×109Nm−2
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D
3.6×107Nm−2
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