Update 2022-02-09 22:41
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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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@@ -1630,7 +1605,7 @@ V_{\mbox{\tiny quad}} ({\bf r}) = \frac{1}{4\pi \varepsilon_0} \frac{1}{r^3} \in
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\]
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and can be rewritten as
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</p>
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<div class="main div" id="org33b3bb2">
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<div class="main div" id="org992e44c">
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<p>
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\[
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V_{\mbox{\tiny quad}} ({\bf r}) = \frac{1}{4\pi \varepsilon_0} \frac{1}{2} \sum_{a,b} \frac{r_a r_b}{r^5} Q_{ab}
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@@ -1641,7 +1616,7 @@ and can be rewritten as
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<p>
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in terms of the {\bf quadrupole moment}
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</p>
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<div class="main div" id="orgf43684b">
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<div class="main div" id="orgc3edafc">
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<p>
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\[
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Q_{ab} = \int_{\cal V} d\tau_s (3 r_{s,a} r_{s,b} - r_s^2 \delta_{a,b}) \rho ({\bf r}_s).
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@@ -1659,7 +1634,7 @@ Moreover, it is traceless, \(\sum_a Q_{aa} = 0\). It therefore has \(5\) indepe
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<p>
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Our expansion for the potential thus looks like
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</p>
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<div class="main div" id="orgbba2343">
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<div class="main div" id="org92525d3">
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<p>
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\[
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V({\bf r}) = \frac{1}{4\pi \varepsilon_0} \left( \frac{Q}{r} + \sum_a \frac{r_a}{r^3} p_a + \frac{1}{2} \sum_{a,b} \frac{r_a r_b}{r^5} Q_{ab} + ... \right)
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@@ -1678,7 +1653,7 @@ the leading nonvanishing multipole moment is independent of the chosen location
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the origin of the coordinate system (see Jackson Prob. 4.4).
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</p>
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<div class="info div" id="orgd3efe3a">
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<div class="info div" id="orgacbf29d">
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<p>
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{\bf A consistent nomenclature for the multipole expansion?}\\\\
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You all know the terms {\bf monopole}, {\bf dipole} and {\bf quadrupole},
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@@ -1748,7 +1723,7 @@ 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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