I understand that $\vec{D}=\varepsilon_0 \vec{E} + \vec{P}$, but, physically, what is the difference between these two vector quantities? What is their physical meaning?
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You can start by checking https://en.wikipedia.org/wiki/Electric_displacement_field and http://farside.ph.utexas.edu/teaching/jk1/Electromagnetism/node40.html – rsaavedra Dec 10 '16 at 02:14
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I understand all the math behind it, but I would like to discuss the physical meaning of these two quantities. – davidaap Dec 10 '16 at 02:30