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(1) Two cylindrical rods, one copper and the other iron, are identical in lengths and cross-sectional areas. They are joined end to end to form

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(1) Two cylindrical rods, one copper and the other iron, 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 copperiron rod. What is the voltage between the ends of the copper rod? Resistivities of copper and iron are respectively: 1.72 x IO'SQm and 9.7 x10'8 Qm

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