Answer:

Explanation:
The 4 wires are connected in series: this means that the same current flow through them, and the voltage of the battery, V0, is equal to the sum of the voltages on each individual resistor:

Also, the equivalent resistance of the series circuit is

The voltage V2 across wire 2 is given by Ohm's law:
(1)
where I is the total current in the circuit, which is given by:

Substituting this into eq. (1), we find an expression for V2:
