What are the ratios of the resistances of
(a) Silver
(b) Aluminum wire to the resistance of copper wire (RAg / RCu and R Al / R Cu) for wires of the same length and the same mass (not the same diameter)?
(c) Which material is the best conductor, for wires of equal length and equal mass? The densities are: silver 10.1 × 103 kg/m3; copper 8.9 × 103 kg/m3; aluminum 2.7 × 103 kg/m3.