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.p1=2.63×10−8Ωm, For Cu,p2=1.72×10−8Ωm. Relative density of AI=2.7 of Cu=8.9.
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if S.P. is $438.60 and gain% is 2% then what is C.P.
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