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The length of a wire is 1.0 m and the area of cross-section is 1.0×10-2cm2. If the work done for increase in length by 0.2 cm is 0.4 joule, then Young's modulus of the material of the wire is

(a) 2.0×1010N/m2             (b) 4×1010N/m2

(c) 2.0×1011N/m2             (d) 2×1010N/m2