ABSTRACT
A current I flowing in a differential vector length d L results in a magnetic field intensity H as d H = I d L × a R 4 π R 2 ( A / m ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203743102/9cca8f32-4688-4a1e-80c2-a6c9068f5153/content/eq776.tif"/>
