Initial diameter, $d_0 = 10.0$ mm $= 10.0 \times 10^{-3}$ m
Tensile force, $F = 1400$ N
Reduction in diameter (change in diameter), $\Delta d = -5.7 \times 10^{-4}$ mm $= -5.7 \times 10^{-7}$ m (negative sign indicates reduction)
Poisson's ratio, $\nu = 0.25$
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