The
net B field in the interior of the solenoid may be expressed as
B = B0 + Bm
(5 9)
Rationalised 2023-24
Physics
146
 EXAMPLE 5 5
where Bm is the field contributed by the material core It turns out that
this additional field Bm is proportional to the magnetisation M of the
material and is expressed as
Bm = m0M
(5