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Two rods are joined end to end, as shown...

Two rods are joined end to end, as shown. Both have a cross-sectional area of `0.01 cm^(2)` . Each is 1 meter long. One rod is of copper with a resistivity of `1.7 xx 10^(–6)` ohm-centimeter, the other is of iron with a resistivity of ` 10^(–5)` ohm-centimeter. How much voltage is required to produce a current of 1 ampere in the rods?

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