Two identical copper wires, each of length 3.0 m and radius 0.40 mm, are available in a laboratory. Consider the following two configurations, both kept at constant temperature.
(a) Let R0 denote the resistance of ONE of the original 3.0 m wires. Express the resistance R(i) of configuration (i) in terms of R0.
(b) Express the resistance R(ii) of configuration (ii) in terms of R0.
(c) Calculate the ratio R(ii)R(i).
(d) Both conductors are separately connected across a 12 V ideal battery. Compare the electrical power dissipated in configuration (i) to that in configuration (ii), and discuss one practical implication of your result for designing low-resistance cabling.