Wire C and wire D are made from different materials and have length LC = LD = 3.1 m. The resistivity and diameter of wire C are 3.3 × 10-6 Ω·m and 1.03 mm, and those of wire D are 1.2 × 10-6 Ω·m and 0.72 mm. The wires are joined as shown in the figure and a current of 2.6 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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C -Lp Lc 3 1

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