define M and H.how are they related to free and bound charges?
Answers
Answer:
Explanation:
In matter, the electric and magnetic fields cause polarization and magnetization of the material. These effects cause, for example, neutral objects to separate opposite charges. The charge densities and currents created entirely from these effects are said to be bound, for they are bound to the material medium. An alternative phrasing is to call them polarization charges and currents, which is somewhat more literal about where they come from. Free charges and currents are those that you can imagine existed even before the medium was polarized or magnetized. It is often the case that one knows what free charges are present in a physical system, and as such, defining D D such that ∇ ⋅ D = ρ f ∇⋅D=ρf is useful to help ignore the effects of bound charges (or, even to help calculate what the bound charges are, if you know the electric field and, hence, the total charge density).