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A copper wire and steel wire of radii 1:2 lens in ratio 2:1 are streached b

A copper wire and steel wire of radii 1:2 lens in ratio 2:1 are streached by same force . If Y of copper is=1.1×10 power 11N/m square and Y of steel is =2×10 power11 N/m square. Then find ratio of their extensions

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