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Two wires one of copper and other of iron having same cross-section area and lengths 2 m and 1.5 m respectively are fastened end and stretched by a load 10 N. If copper wire is stretched by 2mm then find the total extension of combined wire, `Y_(Cu)=1xx10^(11)N//m^(2)` and `Y_(Fe)=3xx10^(11)N//m^(2)`.

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2.5 mm
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