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<h3 id="title" class="align-center">Al Azhar 9th Grade Lesson Notes</h3>
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<a href="/about/author.html" class="sidebar-link link">About the Author</a>
<a href="/about/school.html" class="sidebar-link link">About School</a>
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<h4>Table of Contents</h4>
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<h1 class="banner-text" id="banner-txt">Coulomb's Law</h1>
<h3 class="banner-text" id="banner-txt">Chapter 2</h3>
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<div class="chip"><span>❓ Unchecked by Professionals</span></div>
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<h1 id="definition">Definition</h1>
<p><b>Coulomb's law is a law that explains the releationship between 2 or more electrical charges.</b></p>
<p>This law states that: "The magnitude, or absolute value, of the attractive or repulsive electrostatic force between two point charges is directly proportional to the product of the magnitudes of their charges and inversely proportional to the squared distance between them."<sup>[<a href="#reference-1" class="link-compact">1</a>]</sup></p>
<h1 id="formula">Formula</h1>
<span>F = k <span class="frac"><sup>Q<sub>1</sub> × Q<sub>2</sub></sup><span>⁄</span><sub>r<sup>2</sup></span></span>
<p>
where,<br>
<ul>
<li><b>F</b> = Force (Newton)</li>
<li><b>r</b> = Distance (Metres)</li>
<li><b>Q<sub>1</sub></b> = Charge 1 (Coulomb)</li>
<li><b>Q<sup>2</sup></b> = Charge 2 (Coulomb)</li>
<li><b>K</b> = Constant = <strong>9 × 10<sup>9</sup></strong> <span style="color: gray; font-size: 1rem;">Nm<sup>2</sup> / C<sup>2</sup></span></li>
</ul>
</p>
<h1 id="units">Unit Conversions (for Coulomb)</h1>
<ol>
<li>n <b>mC</b> (<strong>milli</strong>Coulomb) = n * 10<sup>-3</sup> C</li>
<li>n <b>MC</b> (<strong>Micro</strong>Coulomb) = n * 10<sup>-6</sup> C <i>(Alternative form: μC)</i></li>
<li>n <b>nC</b> (<strong>nano</strong>Coulomb) = n * 10<sup>-9</sup> C</li>
<li>n <b>Å</b> (<strong>Ångström</strong>) = n * 10<sup>-10</sup> C</li>
</ol>
<h1 id="example">Example</h1>
<img src="/assets/images/atoms/coulomb1.svg" alt=""><br>
<h2>Given:</h2>
<p>
<strong>r</strong> = 30 cm = 0,3 m = <b>3 × 10<sup>-1</sup> m</b><br>
<strong>Q<sub>1</sub></strong> = 2 MC = <b>2 × 10<sup>-6</sup></b><br>
<strong>Q<sub>2</sub></strong> = 3 MC = <b>3 × 10<sup>-6</sup></b><br>
</p>
<h2>Solution:</h2>
<p>
<span>F = k <span class="frac"><sup>Q<sub>1</sub> × Q<sub>2</sub></sup><span>⁄</span><sub>r<sup>2</sup></span></span><br>
<span>F = 9 × 10<sup>9</sup><span class="frac"><sup>2 × 10<sup>-6</sup> ‧ 3 × 10<sup>-6</sup></sup><span>⁄</span><sub>(3 × 10<sup>-1</sup>)<sup>2</sup></span></span> = <span class="frac"><sup>9 × 10<sup>9</sup> ‧ 2 × 10<sup>-6</sup> ‧ 3 × 10<sup>-6</sup></sup><span>⁄</span><sub>9 × 10<sup>-2</sup></span></span><br>
= <span class="frac"><sup>10<sup>9</sup> ‧ 2 × 10<sup>-6</sup> ‧ 3 × 10<sup>-6</sup></sup><span>⁄</span><sub>10<sup>-2</sup></span></span> = <span class="frac"><sup>10<sup>-3</sup> × 6</sup><span>⁄</span><sub>10<sup>-2</sup></span></span><br>
= <strong>6 × 10<sup>-1</sup></strong>
</p>
<h1 id="references">References</h1>
<ol>
<li id="reference-1">Coulomb, 1785. <i><a href="https://books.google.co.id/books?id=by5EAAAAcAAJ&pg=PA578" class="link">"Second mémoire sur l'électricité et le magnétisme"</a></i></li>
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