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A 3.00-m length of copper wire at 20 ∘C has a 1.20-m-long section with diameter 1.2...

A 3.00-m length of copper wire at 20 ∘C has a 1.20-m-long section with diameter 1.2 mm and a 1.80-m-long section with diameter 0.60 mm . There is a current of 2.3 mA in the 1.2 mm -diameter section.
(a) What is the current in the 0.60 mm -diameter section?
(b) What is the magnitude of E⃗  in the 1.2 mm -diameter section?
(c) What is the magnitude of E⃗  in the 0.60 mm -diameter section?
(d) What is the potential difference between the ends of the 3.00-m length of wire?

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