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A brass rod of length 1M, area 1 mm^(2) ...

A brass rod of length `1M`, area `1 mm^(2)` and Young's modulus `120xx10^(9) N//m^(2)` is connected with steel rod of length `1m`, area `1mm^(2)` and Young's modulus `60xx10^(9)N//m^(2)`. Then the net stress so that extension of system is `0.2mm`

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