Final answer:
In a 2-to-4 decoder circuit, all the wires will have the same voltage, and only one of the output wires will have a non-zero voltage.
Step-by-step explanation:
In a 2-to-4 decoder circuit, the four output wires represent the four possible combinations of inputs. If the four wires are made from the same material, it means they have the same electrical conductivity and resistivity, resulting in equal voltage drops along the wires. Therefore, all the wires will have the same voltage. Additionally, since the input lines of a 2-to-4 decoder are mutually exclusive, only one output will be active at a time. This means that only one of the output wires will have a non-zero voltage.