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Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter ? Hence explain why aluminium wires are perferred for overhead power cables. Given For `AI. p_(1)=2.63xx10^(-8)Omega m`, For `Cu, p_(2)=1.72xx10^(-8)Omega m`. Relative density of `AI =2.7` of `Cu =8.9`.

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