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An iron rod of length 2m and cross section area of 50 X 10-6 m2 , is stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. Young's modulus of the iron rod is-
(a) 19.6×1010N/m2 (b) 19.6×1015N/m2
(c) 19.6×1018N/m2 (d) 19.6×1020N/m2