Update 2022-02-08 17:21
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-11
@@ -1,7 +1,7 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<!-- 2022-02-08 Tue 06:55 -->
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<!-- 2022-02-08 Tue 17:21 -->
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Pre-Quantum Electrodynamics</title>
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@@ -272,6 +272,10 @@ Table of contents
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</summary>
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<ul>
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<li>
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<a href="./in_t_l.html#in_t_l">Section and equation labelling</a><span class="headline-id">in.t.l</span>
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</li>
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<li>
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<a href="./in_t_c.html#in_t_c">Contextual colors</a><span class="headline-id">in.t.c</span>
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</li>
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@@ -736,7 +740,7 @@ Table of contents
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</li>
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<li>
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<a href="./emsm_esm_d.html#emsm_esm_d">Dielectrics</a><span class="headline-id">emsm.esm.d</span>
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<a href="./emsm_esm_di.html#emsm_esm_di">Dielectrics</a><span class="headline-id">emsm.esm.di</span>
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</li>
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<li>
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@@ -1654,7 +1658,7 @@ dI = \frac{\partial \sigma_b}{\partial t} da_{\perp} = \frac{\partial P}{\partia
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\]
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We therefore have the
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</p>
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<div class="core div" id="orgb555ebf">
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<div class="core div" id="orgff46cb4">
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<p>
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{\bf Polarization current density}
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\[
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@@ -1672,7 +1676,7 @@ the polarization current is the result of linear motion of charge when
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polarization changes). We can check consistency with the continuity equation
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associated to the conservation of bound charges:
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</p>
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<aside id="org86c5ff2">
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<aside id="orgbce7d73">
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<p>
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Note the unfortunate labelling: it would have been nicer to have \(\rho_b\) be the charge associated to current
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\({\boldsymbol J}_b\) but this is not the convention used here.
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@@ -1695,7 +1699,7 @@ Changing magnetization does not lead to analogous accumulation of charge and cur
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In view of this: total charge density can be separated into 2 parts,
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{\it free} and {\it bound}:
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</p>
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<div class="main div" id="orgf8c82b2">
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<div class="main div" id="org4df7865">
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<p>
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\[
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\rho = \rho_f + \rho_b = \rho_f - {\boldsymbol \nabla} \cdot {\bf P}
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@@ -1708,7 +1712,7 @@ In view of this: total charge density can be separated into 2 parts,
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and current can be separated into three parts, {\it free}, {\it bound} and
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{\it polarization}:
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</p>
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<div class="main div" id="org4054380">
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<div class="main div" id="orgcc32502">
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<p>
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\[
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{\bf J} = {\bf J}_f + {\bf J}_b + {\bf J}_p = {\bf J}_f + {\boldsymbol ∇} × {\bf M}
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@@ -1732,7 +1736,7 @@ Gauss's law: can be rewritten
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\]
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where (as in static case)
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</p>
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<div class="core div" id="orgf78b92c">
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<div class="core div" id="org7600f00">
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<p>
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\[
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{\bf D} \equiv \varepsilon_0 {\bf E} + {\bf P}
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@@ -1758,7 +1762,7 @@ or
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\]
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where as before
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</p>
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<div class="core div" id="org513c514">
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<div class="core div" id="orgb942ad8">
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<p>
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\[
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{\bf H} \equiv \frac{1}{\mu_0} {\bf B} - {\bf M}
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@@ -1776,7 +1780,7 @@ bound parts, since they don't involve \(\rho\) or \({\bf J}\).
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<p>
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In terms of free charges and currents, we thus get
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</p>
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<div class="core div" id="org686ea33">
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<div class="core div" id="orgd9d30d5">
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<p>
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{\bf Maxwell's equations {\it (in matter)}}
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</p>
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@@ -1802,7 +1806,7 @@ Must be complemented by the {\bf constitutive relations} giving \({\bf D}\) and
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in terms of \({\bf E}\) and \({\bf B}\).
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For the restricted case of linear media:
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</p>
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<div class="main div" id="org6accc1d">
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<div class="main div" id="orge1df28e">
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<p>
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\[
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{\bf P} = \varepsilon_0 \chi_e {\bf E}, \hspace{1cm}
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@@ -1826,7 +1830,7 @@ where \(\varepsilon \equiv \varepsilon_0(1 + \chi_e)\) and \(\mu \equiv \mu_0 (1
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<hr><div id="postamble" class="status">
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<p class="author">Author: Jean-Sébastien Caux</p>
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<p class="date">Created: 2022-02-08 Tue 06:55</p>
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<p class="date">Created: 2022-02-08 Tue 17:21</p>
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<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
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</div>
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