| vector quantity obtained at a given point by subtracting the magnetization M from the magnetic flux density B divided by the magnetic constant μ0:
NOTE 1 – In vacuum, the magnetic field strength is at all points equal to the magnetic flux density divided by the magnetic constant:
NOTE 2 – The rotation of the magnetic field strength is the total current density Jt:
rot H = Jt
NOTE 3 – The magnetic flux density B is sometimes called “magnetic field”, risking confusion with the magnetic field strength H.