Magnetic field
Common formulæ

Additional magnetic field values can be found through the magnetic field of a finite beam, for example, that the magnetic field of an arc of angle θ {\displaystyle \theta } and radius R {\displaystyle R} at the center is B = μ 0 θ I 4 π R {\displaystyle B={\mu _{0}\theta I \over 4\pi R}}, or that the magnetic field at the center of a N-sided regular polygon of side a {\displaystyle a} is B = μ 0 N I π a sin π N tan π N {\displaystyle B={\mu _{0}NI \over \pi a}\sin {\pi \over N}\tan {\pi \over N}}, both outside of the plane with proper directions as inferred by right hand thumb rule.
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