Electrical essay: Which source feeds which load?

Two similar batteries, X
1
and X
2
, of the same voltage feed two equal loads, R
1
and R
2
, by connecting wires as shown in Figure 1. The wires from A to B, and from B to C are interlaced tightly so that very little magnetic field outside their neighborhood is produced by the interlaced wires. These wires are at nearly the same potential, so that the electric field between them is very feeble.