Update 2022-02-17 08:44
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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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<!-- 2022-02-15 Tue 10:14 -->
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<!-- 2022-02-17 Thu 08:42 -->
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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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@@ -1600,7 +1600,7 @@ Table of contents
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<p>
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This is given experimentally (around 1820) by the
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</p>
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<div class="core div" id="orgbc2d279">
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<div class="core div" id="org1dfe443">
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<p>
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{\bf Biot-Savart law}
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\[
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@@ -1622,7 +1622,7 @@ with the {\it henry} \(H = kg m^2 / s^2 A^2\) being the unit for inductance.
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<p>
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For surface and volume density currents:
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</p>
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<div class="main div" id="org4a4410a">
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<div class="main div" id="org6699541">
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<p>
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\[
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{\bf B} ({\bf r}) = \frac{\mu_0}{4\pi} \int da' \frac{{\bf K} ({\bf r}') \times ({\bf r} - {\bf r}')}{|{\bf r} - {\bf r}'|^3},
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@@ -1644,7 +1644,7 @@ The {\bf superposition principle} applies here as well: collection of currents
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the vector sum of the fields generated by the individual currents.
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</p>
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<div class="example div" id="org211629b">
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<div class="example div" id="org0a013dc">
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<p>
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\paragraph{Example 5.5:} find \({\bf B}\) a distance \(s\) from a long straight wire carrying steady current \(I\).
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\paragraph{Solution:} {\bf Gr Fig 5.18}:
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@@ -1674,7 +1674,7 @@ f = \frac{\mu_0}{2\pi} \frac{I_1 I_2}{d}
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(like currents attract).
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</p>
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<div class="example div" id="orgb6409c3">
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<div class="example div" id="orgad33616">
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<p>
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\paragraph{Example 5.6:} find {\bf B} a distance \(z\) above the center of a circular loop of radius \(R\),
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carrying a steady counterclockwise current \(I\).
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@@ -1707,7 +1707,7 @@ 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: 2022-02-15 Tue 10:14</p>
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<p class="date">Created: 2022-02-17 Thu 08:42</p>
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<p class="validation"></p>
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</div>
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