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I learned E&M from Griffiths, and for the most part I understood everything - I am very comfortable using Maxwell's equations, at least in the

**E**and

**B**form.

However, the same is not true of

**D**and

**H**, which I really don't understand at all. The reason that I am having trouble learning these concepts from Griffiths may be that the concepts that lead up to them are introduced in fairly quick succession, so that I have to increase the abstraction in my thinking too quickly for me to grasp each level of abstraction.

For instance, in leading to the electric displacement

**D**, Griffiths introduces the dipole moment

**p**on page 149, which I am fine with. However, the polarization

**P**is introduced on page 166, the bound surface and volume charge densities σ

_{b}and ρ

_{b}on page 167 and 168, and the electric displacement

**D**on page 175, and I am having difficulty grasping these concepts.

Similarly,

**m**is encountered on page 257,

**M**on page 262,

**J**

_{b}and

**K**

_{b}on page 264, and

**H**on page 269.

So, although for the most part I find all of Griffiths' textbooks to be superb resources, his E&M textbook is not working for me on these particular subjects. Does anyone know of some good resources (preferably online, eg., online lecture notes. I'm not looking to buy a whole new textbook) that explain the above concepts, perhaps more slowly or with a different approach than does Griffiths?

Thanks very much for any help that you can give.

-HJ Farnsworth