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Okay, so Young Modulus = (Force/Area)/(Extension/Original length). They have given Young modulus, Area and Original length. We calculate force by 70 x 9.81. So, extension of 1 wire = ((70 x 9.81) x 20)/(3.2 x 10^-6 x 2.1 x 10^11). There are 200 wires in all, so total extension is given by the previous answer divided by 200, 0.1 mm... C!