Four parallel wires that are long and straight are positioned as shown. Two of the wires carry currents that are directed outward, and two of the wires carry currents that are directed inward. All four currents have equal magnitude. Which one of the following phrases best describes the direction of the net magnetic force acting on the wire shown at the top? X O vertically upward O vertically downward outward O Inward The net force on the wire could be zero newtons