Question

A wire is made of two equal-diameter segments with conductivities σ1 and σ2. When a current...

A wire is made of two equal-diameter segments with conductivities σ1 and σ2. When a current passes through the wire, a thin layer of charge appears at the boundary between the segments, as shown below.

Material 1 is iron and material 2 is copper. Both wires are 1.0 mm in diameter and 25 cm long. The current is 2.5 A.

What is the voltage across the iron wire?

What is the voltage across the copper wire?

How much charge accumulates at the boundary? You can use Gauss's law to determine this. Note the sign of the charge. The diagram shows +, but this may not be correct.

How many electrons accumulate at the interface between two two wires?

Please answer ALL parts of the question and show the work clearly

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