A 10.0-m length of wire consists of 5.0 m of copper followed by 5.0 m of aluminum,

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A 10.0-m length of wire consists of 5.0 m of copper followed by 5.0 m of aluminum, both of diameters 1.0mm. A voltage difference of 85 mV is placed across the composite wire.
(a) What is the total resistance (sum) of the two wires?
(b) What is the current through the wire?
(c) What are the voltages across the aluminum part and across the copper part?
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