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A 3.00 m long copper wire has a 1.20 m long section with a 1.60 mm...

A 3.00 m long copper wire has a 1.20 m long section with a 1.60 mm diameter and a 1.80 m long section with a 0.80 mm diameter. The electric current is 2.5 mA (milli Amps) in the 1.60 mm diameter section. The electrical resistivity of copper is 1.68 x 10^-8 Ω m.

a) (10pts) What is the current density in the 1.60 mm diameter section?

b) (10pts) What is the magnitude of the electric field in N / C in the 1.60 mm diameter section?

c) (10pts) What is the magnitude of the electric field in N / C in the section of 0.80 mm diameter?

d) (20pts) What is the potential difference across the 1.80m long section?

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