Magnetic Field of Wire

$B_{\text{wire}}=\frac{{\mu }_{0}I}{2\pi r}$

• The magnitude of the magnetic field $B_{\text{wire}}$ of an infinitely long straight wire carrying current $I$ measured a distance $r$ from the wire
• ${\mu }_0$ is the magnetic constant
• For an infinite wire
• The direction is determined by the right hand rule

$B_{\text{wire}}=\frac{{\mu }_0{I}_{\text{enc}}}{4\pi s}(\sin {\theta }_2-\sin {\theta }_1)\hat{\varphi }$

• ${\theta }_2$ is the angle subtended between the point of observation and the end of wire that is higher in $z$