You may have used a set of jumper cables to start a car with a dead battery from a running vehicle. Jumper cables are a matched pair of wires, red and black, that are joined together along their length. Suppose we have a set of jumper cables in which the two wires are separated by 1.2 cm along their 3.7m (roughly 12 feet) length. While starting a car, the wires each carry a current of 150 A, in opposite directions. What is the force between the two wires?