Chapter 2: Introduction to Electrodynamics

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The constitutive relations for vacuum, D =ε0 E and B =μ0 H , can be generalized to D =εE , B =μH , and J =σE for simple media. Media are discussed further in Section 2.5. Maxwell’s equations require conservation of charge. By taking the divergence of Ampere’s law (2.1.6) and noting the vector identity ∇•∇(×A) =0 , we find:

  Maxwell, Relations