ABSTRACT
A continuous flow of electric charges is called an electric current, and it generates another special vector field known as a magnetic field. A Danish physicist Oersted is known to have first noticed the deflection of a compass needle around a current-carrying wire. Subsequent experimental and theoretical studies have led to the following mathematical expression for magnetic vector field https://www.w3.org/1998/Math/MathML"> B → https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003397496/c9619a4c-33ea-4757-afe2-97610a8ab4e4/content/math5_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> , due to an arbitrarily shaped wire with a steady current of magnitude I.
