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- Two cylindrical rods, one copper (resistivity 1.72 x 10-8 Ω·m) and the other iron (resistivity 9.7 x 10-8 Ω·m), are identical in lengths and cross-sectional areas. They are joined end to end to form one long rod. A 12-V battery is connected across the free ends of the copper-iron rod. What is the voltage between the ends of the copper rod?

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