Magnetic Force of Parallel Wires

$f=\frac{{\mu }_0}{2\pi }\frac{I_1{I}_2}{d}$

• Magnitude of the force per unit length
• Direction of force is determined by the right hand rule. Current flowing parallel will result in attraction, current flowing antiparallel will result in repulsion
• ${\mu }_0$ is the magnetic constant
• $I_1$ is the current going through one of the wires
• $d$ is the distance between the wires