A load of 4 kg is suspended from a ceiling through a steel wire of length 20 m and radius 2 mm. It is found that the length of the wire increases….

Q: A load of 4 kg is suspended from a ceiling through a steel wire of length 20 m and radius 2 mm. It is found that the length of the wire increases by 0.031 mm, as equilibrium is achieved. If g = 3.1 × π ms-2 , the value of Young’s modulus of the material of the wire (in Nm-2)

(a) 2 × 1012

(b) 4 × 1011

(c) 2 × 1011

(d) 0.02 × 109

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Ans: (a)