Maxwell Equations, Macroscopic Electromagnetism, Conservation Laws — John David Jackson
Physics — E&M · magnetized-bar-adhesion-force
Problem
Show that in general a long, straight bar of uniform cross-sectional area A with uniform lengthwise magnetization M, when placed with its flat end against an infinitely permeable flat surface, adheres with a force given approximately by
F≃2μ0AM2
Relate your discussion to the electrostatic considerations in Section 1.11.