Abstract
The field of a ‘soft' ellipsoidal magnet immersed in a permeable fluid, and the torque exerted on it by an externally applied uniform field, are obtained by simple direct methods. Different ways of defining dipole moment are discussed and it is shown that, with suitable definitions, the moments
m
or
j
which specify the external field of the magnet also give the torque
T
with
T
=
m
x
B
0
=
j
x
H
0
. The permeability of the fluid does
not
enter simply as a factor, and neither of the conventional Kennelly or Sommerfeld approaches is correct.
Reference17 articles.
1. A braham 1VL & Becker R . 1937 Electricity and magnetism. London: Blackie.
2. E lectric an d m agnetic forces: a direct calculation. A m . J;Brow W .;Phys.,1951
3. B row n W . F . 1966 Magnetoelastic interactions. B erlin: Springer-Verlag.
4. Coulomb Law C om m ittee 1950 The teaching of electricity and m agnetism a t th e College level. A m . J . P hys. 18 1-25 69-88.
5. D iesselhorst H . 1948 F ield effects in perm eable m edia and definition of m agnetic m om ent. A n n in P hys. 3 11-30. (In German.)
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