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 copper-iron rod. what is the voltage between the ends of the copper rod?
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(l = length , a = area, ρ = resistivity of copper)Ri = resistance of iron = 
(l = length , a = area, ρ₀ = resistivity of copper)
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