lecture 3

Lecture 3
Maxwell defined the electric displacement vector D as follows:
D=?_o E+P ….. (1-1)
(What is the electric displacement?)
In the case of free space (why?)
D=?_o E ….. (1-2)
and for an isotropic linear dielectric (what does the isotropic mean?),
D=?E ….. (1-3)
From eq.(1) and eq. (3) we get:
P=?(?-??_o)E=??_o E ….. (1-4)
which gives the relationship between the polarization P and the electric field E that produces P. The factor ?, known as the electric susceptibility, is given by
?=(?/?_o )-1 ….. (1-5)
The general expression for B can be written as:
B=?_o (H+M) …… (1-6)
where H is a convenient vector quantity that provides for a different expression of the magnetic flux B, that is, in a form that allows the parallel treatment of the electric and magnetic flux laws. For a vacuum,
B=?_o H …… (1-7)


Lecture 3
Maxwell defined the electric displacement vector D as follows:
D=?_o E+P ….. (1-1)
(What is the electric displacement?)
In the case of free space (why?)
D=?_o E ….. (1-2)
and for an isotropic linear dielectric (what does the isotropic mean?),
D=?E ….. (1-3)
From eq.(1) and eq. (3) we get:
P=?(?-??_o)E=??_o E ….. (1-4)
which gives the relationship between the polarization P and the electric field E that produces P. The factor ?, known as the electric susceptibility, is given by
?=(?/?_o )-1 ….. (1-5)
The general expression for B can be written as:
B=?_o (H+M) …… (1-6)
where H is a convenient vector quantity that provides for a different expression of the magnetic flux B, that is, in a form that allows the parallel treatment of the electric and magnetic flux laws. For a vacuum,
B=?_o H …… (1-7)