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                                    Two wires of equal length, one of aluminium and the othér of copper16havexpe the same resistance. Which of the two wires is lighter? Hencelain why aluminium wires are preferred for overhead power cables.= 2.63 x10-8 Ω m, focu-1.72 x 10-8 Ω m, Relative density ofAl 2.7, of Cu 8.9.)the follon nơ observations on a | 
                            
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