(Solution) - A 3 00 m length of copper wire at 20oC has a -(2025 Original AI-Free Solution)

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A 3.00-m length of copper wire at 20oC has a 1.20-m-long section with diameter 1.60 mm and a 1.80-m-long section with diameter 0.80 mm. There is a current of 2.5 m A in the 1.60-mm diameter section.
(a) What is the current in the 0.80-mm-diameter section?
(b) What is the magnitude of E in the 1.60-mm diameter section?
(c) What is the magnitude of E in the 0.80-mm diameter section?
(d) What is the potential difference between the ends of the 3.00-m length of wire?