Final answer:
Two parallel wire loops with currents in opposite directions repel each other due to the magnetic fields they generate impacting the other in a way that causes repulsion.
Step-by-step explanation:
When two loops of wire are parallel to each other and carry currents in opposite directions, they will exert repulsive forces on each other. According to the right-hand rule, which helps determine the direction of the magnetic field and magnetic force, the loops will push away from each other because the currents are going in opposite directions. This is explained by the augmentation of the magnetic field in between the wires when currents are in opposite directions, leading to a repulsion due to their opposite magnetic fields.