(12.90a) free displacement + H. i.c., v x B = HJe+ H, fo (12.90b) frve In effect, we have V x (B- 4, M)- H, Eo (12.90c) %3D at i.c., V x DE -- M-E (12.90d) The vector M contains the essential magnetic bulk property of the medium in the continuum hypothesis, and is called the magnetic intensity field, defined as -M. (12.91) Magnetic properties of materials are usually compiled in terms of the relationship between the magnetic field intensity H and the magnetization M. Typically, this relation has the following form: M7) = x.FiG), (12.92a) %3D so that we shall have (12.92a) X, is called the magnetic susceptibility of the material, and u H,(1 +X) is called the magnetic permeability of the material. From Eq. 12.90d, it follows that V xH- e (12.93) aT(F, 1) at (4.38a) %3D (4.38b) at %3D dt k'gu*R(F), (4.38c) 1 dgt) VR(F) = - ik² , R(F) (4.38d) %3D g(r) dt 1 dgt) + ik = 0. (4.38e) g(t) di 12 Show that the magnetic intensity field H inside a conducting material satisfies the diffusion equation (Eq. 4.38, Chapter 4). Hint: Use Eq. 12.93. ignoring the time-dependent term.

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V x B = H, J trce + H, J duplacement * Ho J benand
(12.90a)
i.c., v x B = MJme+ H, lo
(12.90b)
frve
In effect, we have
JE
i x (B- H, M)- H, E
(12.90c)
i.e., V x
- M- E
Ho
(12.90d)
The vector
contains the essential magnetic bulk property of the medium in the
continuum hypothesis, and is called the magnetic intensity field, defined as
BM.
H =
Ho
(12.91)
Magnetic properties of materials are usually compiled in terms of the relationship between
the magnetic field intensity H and the magnetization M. Typically, this relation has the
following form:
= X.
(12.92a)
so that we shall have
B = H,H + M = (H, + HoX„) = H,(1 + Xm)H= uH.
(12.92a)
X. is called the magnetic susceptibility of the material, and u = H(1+ X) is called the
magnetic permeability of the material. From Eq. 12.90d, it follows that
(12.93)
(4.38a)
%3D
at
IR(F)g(t)| =
(4.38b)
dgt)
R(F)-
k'gtV*R(F),
(4.38c)
dt
1 dgt)
_v*R(F) = - ik,
R(F)
(4.38d)
%3D
g(t) dt
1 dg(t)
+ ik = 0.
(4.38e)
g(t) de
12
Show that the magnetic intensity field H inside a conducting material satisfies the diffusion
equation (Eq. 4.38, Chapter 4).
Hint: Use Eq. I2.93, ignoring the time-dependent term.
Transcribed Image Text:V x B = H, J trce + H, J duplacement * Ho J benand (12.90a) i.c., v x B = MJme+ H, lo (12.90b) frve In effect, we have JE i x (B- H, M)- H, E (12.90c) i.e., V x - M- E Ho (12.90d) The vector contains the essential magnetic bulk property of the medium in the continuum hypothesis, and is called the magnetic intensity field, defined as BM. H = Ho (12.91) Magnetic properties of materials are usually compiled in terms of the relationship between the magnetic field intensity H and the magnetization M. Typically, this relation has the following form: = X. (12.92a) so that we shall have B = H,H + M = (H, + HoX„) = H,(1 + Xm)H= uH. (12.92a) X. is called the magnetic susceptibility of the material, and u = H(1+ X) is called the magnetic permeability of the material. From Eq. 12.90d, it follows that (12.93) (4.38a) %3D at IR(F)g(t)| = (4.38b) dgt) R(F)- k'gtV*R(F), (4.38c) dt 1 dgt) _v*R(F) = - ik, R(F) (4.38d) %3D g(t) dt 1 dg(t) + ik = 0. (4.38e) g(t) de 12 Show that the magnetic intensity field H inside a conducting material satisfies the diffusion equation (Eq. 4.38, Chapter 4). Hint: Use Eq. I2.93, ignoring the time-dependent term.
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