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 prefered for overhead power cables ? Given `rho Al=2.63xx10^(-8) Omega m rho Cu=0.72xx10^(-8) Omega m` , relative density of Al=2.7 and that of Cu =8.9.

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 .

Two copper wires have equal length but the thickness of one is twice that of the other. If the resistance of the thin wire is 10 Omega , find the resistance of the thick wire.

Two copper wires A and B of length 30 m and 10 m have radii 2 cm and 1 cm respectively. Compare the resistances of the two wires. Which will have less resistance ?

Calculate the resistance of an aluminium wire of length 50 cmand cross sectional area 2.0mm^(2) . The resistivity of aluminium is (rho)=2.6xx10^(-8)(Omega)m.

What is the length of a wire of radius 0.2 mm and resitance 25 Omega ? The restivity of the material of the wire is 2pi xx 10^(-8) Omega.m.

There are two wires of copper and iron of the same length but difference radii .When equal potential difference between the ends of each wire, the same current flows in them. What the ratio of their radii .Specific resistance of copper and irons are 1.6 xx 10^(-8) Omega m and 1.0 xx 10^(-7) Omega m respectively