10)
where m0 is the same constant (permittivity of vacuum) that appears in
Biot-Savart’s law It is convenient to introduce another vector field H, called the magnetic
intensity, which is defined by
0
–
µ
H= B
M
(5 11)
where H has the same dimensions as M and is measured in units of A m–1 Thus, the total magnetic field B is written as
B = m0 (H + M)
(5