Note that two wires carrying current in the same direction attract each other, and they repel if the currents are opposite in direction. The calculation below applies only to long straight wires, but is at least useful for estimating forces in the ordinary circumstances of short wires.
What are magnetic fields? Magnetic force between two currents going in the same direction. Magnetic force between two currents going in opposite directions. Induced current in a wire. Next tutorial. Electric motors.
Parallel wires carrying current produce significant magnetic fields, which in turn produce significant forces on currents. Learning Objective. Express the magnetic force felt by a pair of wires in a form of an equation.