Chapter 25, Problem 25.54P

A 2.0-m length of wire is made by welding the end of a 120-cm-long silver wire to the end of an 80-cm-long copper wire. Each piece of wire is 0.60 mm in diameter. The wire is at room temperature, so the resistivities are as given in Table 25.1. A potential difference of 9.0 V is maintained between the ends of the 2.0-m composite wire. What is (a) the current in the copper section; (b) the current in the silver section: (c) the magnitude of $\stackrel{\to }{\text{E}}$ in the copper; (d) the magnitude of $\stackrel{\to }{\text{E}}$ in the silver; (e) the potential difference between the ends of the silver section of wire?