Directions of Current in Two Wires?
Current carrying wire does not have extra charge but only flow So there is no electrostatic force between them. The magnetic force is present only when current flows through both wires. If it flows in the same direction then they attract. So if the lower wire is fixed and you wish to suspend the above it must repel it to overcome the gravitational force due to earth acting on it. Hence the wires must carry currents in opposite direction.