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Two cylindrical rods, one copper (resistivity 1.72 x 108 0-m) and the other iron (resistivity 9.7 x 108 0-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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