Walker, Halliday & Resnick — Current and Resistance: Problem 25

25 Wire C and wire D are made from different materials and have length \(L_C = L_D = 1.0 \text{ m}\). The resistivity and radius of wire C are \(2.0 \times 10^{-6} \text{ }\Omega\cdot\text{m}\) and \(1.00 \text{ mm}\), and those of wire D are \(1.0 \times 10^{-6} \text{ }\Omega\cdot\text{m}\) and \(0.50 \text{ mm}\). The wires are joined as shown in Fig. 26-23, and a current of \(2.0 \text{ A}\) is set up in them. What is the electric potential difference between (a) points 1 and 2 and (b) points 2 and 3? What is the rate at which energy is dissipated between (c) points 1 and 2 and (d) points 2 and 3?