Wire C and wire D are made from different materials and have length LC = LD = 4.3 m. The resistivity and diameter of wire C are 3.4 × 10-6 Ω·m and 1.15 mm, and those of wire D are 1.1 × 10-6 Ω·m and 0.78 mm. The wires are joined as shown in the figure and a current of 4.9 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?

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