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

Concept Videos :-

Concept Questions :-

(a) Y=MgLAl=250×9.8×250×10-6×0.5×10-3                 =19.6×1010N/m2

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