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85. An iron rod of length 2m and cross section area of , 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) 19.6×1010 N/m2                           (b)  19.6×1015 N/m2

(c)  19.6×1018 N/m2                           (d) 19.6×1020 N/m2

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