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Calculate the work done in stretching a uniform metal wire (area of cross - section 10-6m2 and length 1.5 m) through 4x10-3m. The Young’s modulus for the wire is 2 x 1011N/m2 .

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Consider a wire of length L and area of cross - section A. Let L be the increase in the length when a stretching force F is applied. The work done dW in increasing the length dL is given by

dW = F x dL

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