Update 2022-02-09 22:41
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@@ -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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<!-- 2022-02-09 Wed 07:31 -->
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<!-- 2022-02-09 Wed 22:40 -->
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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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@@ -408,17 +408,13 @@ Table of contents
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<li>
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<a href="./ems_es_ep_fp.html#ems_es_ep_fp">Field in terms of the potential</a><span class="headline-id">ems.es.ep.fp</span>
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</li>
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<li>
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<a href="./ems_es_ep_c.html#ems_es_ep_c">Comments on the Electrostatic Potential</a><span class="headline-id">ems.es.ep.c</span>
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</li>
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<li>
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<a href="./ems_es_ep_ex.html#ems_es_ep_ex">Example calculations for the potential</a><span class="headline-id">ems.es.ep.ex</span>
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</li>
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<li>
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<a href="./ems_es_ep_PL.html#ems_es_ep_PL">The Poisson Equation and the Laplace Equation</a><span class="headline-id">ems.es.ep.PL</span>
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<a href="./ems_es_ep_PL.html#ems_es_ep_PL">Poisson's and Laplace's Equations</a><span class="headline-id">ems.es.ep.PL</span>
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</li>
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<li>
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@@ -430,29 +426,8 @@ Table of contents
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</details>
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</li>
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<li>
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<details>
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<summary>
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<a href="./ems_es_e.html#ems_es_e">Electrostatic Energy from the Potential</a><span class="headline-id">ems.es.e</span>
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</summary>
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<ul>
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<li>
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<a href="./ems_es_e_pcd.html#ems_es_e_pcd">The Energy of a Point Charge Distribution</a><span class="headline-id">ems.es.e.pcd</span>
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</li>
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<li>
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<a href="./ems_es_e_ccd.html#ems_es_e_ccd">The Energy of a Continuous Charge Distribution</a><span class="headline-id">ems.es.e.ccd</span>
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</li>
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<li>
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<a href="./ems_es_e_c.html#ems_es_e_c">Comments on Electrostatic Energy</a><span class="headline-id">ems.es.e.c</span>
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</li>
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</ul>
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</details>
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</li>
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<li>
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@@ -1667,14 +1642,14 @@ sphere of radius \(r\) around the charge,
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<p>
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so by superposition, we obtain
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</p>
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<div class="eqlabel" id="org552cd00">
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<div class="eqlabel" id="orga95646c">
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<p>
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<a id="Gl_i"></a><a href="./ems_es_ef_Gl.html#Gl_i"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org6dc5103">
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<div class="alteqlabels" id="org8136129">
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<ul class="org-ul">
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<li>Gr (2.13)</li>
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</ul>
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@@ -1682,7 +1657,7 @@ so by superposition, we obtain
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</div>
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</div>
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<div class="core div" id="orgebfc03c">
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<div class="core div" id="org54f9782">
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<p>
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<b>Gauss' law (in integral form)</b>
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</p>
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@@ -1714,14 +1689,14 @@ By applying the divergence theorem,
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and using \(Q_{\mbox{enc}} = \int_{\cal V} \rho d\tau\), and using the fact the the choice of volume
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is arbitrary, we get
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</p>
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<div class="eqlabel" id="orga1e9bf0">
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<div class="eqlabel" id="orgef416a1">
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<p>
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<a id="Gl_d"></a><a href="./ems_es_ef_Gl.html#Gl_d"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org79262b5">
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<div class="alteqlabels" id="org2f1cd9b">
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<ul class="org-ul">
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<li>Gr (2.14)</li>
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</ul>
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@@ -1729,7 +1704,7 @@ is arbitrary, we get
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</div>
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</div>
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<div class="core div" id="org1c01bba">
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<div class="core div" id="orgdb0d047">
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<p>
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<b>Gauss' law in differential form</b>
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</p>
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@@ -1788,7 +1763,7 @@ cylindrical or plane symmetry.
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Gaussian surfaces: respectively, concentric sphere, coaxial cylinder, pillbox.
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</p>
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<div class="example div" id="org139e93f">
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<div class="example div" id="org4b1103a">
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<p>
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<b>Example 2.2</b>: Field outside a uniformly charged sphere of radius \(R\) and total charge \(q\).
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</p>
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@@ -1819,7 +1794,7 @@ Same as point charge at origin!
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</div>
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<div class="example div" id="org9001b7b">
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<div class="example div" id="org416d743">
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<p>
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<b>Example 2.3</b>: infinitely long cylinder carrying charge density \(\rho = k s\) for some constant \(k\). Find \({\bf E}\) within the cylinder.
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</p>
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@@ -1858,7 +1833,7 @@ Therefore,
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</div>
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<div class="example div" id="orgb2c877e">
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<div class="example div" id="org335f5d0">
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<p>
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<b>Example 2.4</b>: infinite plane (defined by \(z = 0\)) with uniform surface charge density \(\sigma\). Find \({\bf E}\).
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</p>
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@@ -1884,7 +1859,7 @@ where \(\hat{\bf n}\) is a unit vector extending away from the plane. Independe
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</div>
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<div class="example div" id="orga697386">
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<div class="example div" id="org75a3050">
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<p>
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<b>Example 2.5</b>: two infinite planes (put them vertical) carrying equal but opposite uniform surface charge densities \(\pm \sigma\).
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</p>
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@@ -1912,7 +1887,7 @@ target="_blank">Creative Commons Attribution 4.0 International License</a>.
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</div>
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<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: 2022-02-09 Wed 07:31</p>
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<p class="date">Created: 2022-02-09 Wed 22:40</p>
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<p class="validation"></p>
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</div>
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