What is the electric displacement field?

Discussing the definition of the electric displacement field D, why it's defined the way it is, and how its properties differ from those of the ordinary electric field E. Along the way, we also introduce electric susceptibility and permittivity.

Bound charge density:    • Bound charge density: why does ρ = -∇⋅P?  
Bound surface charge:    • Polarisation and surface charge: why ...  

About me: I studied Physics at the University of Cambridge, then stayed on to get a PhD in Astronomy. During my PhD, I also spent four years teaching Physics undergraduates at the university. Now, I'm working as a private tutor, teaching Physics & Maths up to A Level standard.

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