http://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&feed=atom&action=historyElectromagnetic field - Revision history2024-03-29T10:50:38ZRevision history for this page on the wikiMediaWiki 1.36.2http://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5395&oldid=prevShironeko: Clarification.2008-02-09T04:00:32Z<p>Clarification.</p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The '''electromagnetic field''' describes the force on an electrically charged particle due to the presence of other charges. Because the total electromagnetic force depends both on the particle's charge and its velocity, the electromagnetic field is usually treated as the combination of separate, but related, [[force field]]s: the '''electric field''' is the force per charge on a stationary test particle, while the '''magnetic field''' determines the contribution due to the particle's velocity.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The '''electromagnetic field''' describes the force on an electrically charged particle due to the presence of other charges. Because the total electromagnetic force depends both on the particle's charge and its velocity, the electromagnetic field is usually treated as the combination of separate, but related, [[force field]]s: the '''electric field''' is the force per charge on a stationary test particle, while the '''magnetic field''' determines the contribution due to the particle's velocity.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Electric charge can be either positive or negative. Particles with charges of the same sign repel each other, while particles with charges of opposite signs attract, <del style="font-weight: bold; text-decoration: none;">with </del>the magnitude of the force given by Coulomb's Law:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Electric charge can be either positive or negative. Particles with charges of the same sign repel each other, while particles with charges of opposite signs attract<ins style="font-weight: bold; text-decoration: none;">. If the charges are stationary</ins>, the magnitude of the <ins style="font-weight: bold; text-decoration: none;">''electrostatic </ins>force<ins style="font-weight: bold; text-decoration: none;">'' is </ins>given by Coulomb's Law:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:[[Image:Coulomb's Law.png]],</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:[[Image:Coulomb's Law.png]],</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>where ''q<sub>1</sub>'' and ''q<sub>2</sub>'' are the charges, ''r'' is the distance between them, and ''&epsilon;<sub>0</sub>'' is the [[physical constant|permittivity of free space]].</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>where ''q<sub>1</sub>'' and ''q<sub>2</sub>'' are the charges, ''r'' is the distance between them, and ''&epsilon;<sub>0</sub>'' is the [[physical constant|permittivity of free space]]<ins style="font-weight: bold; text-decoration: none;">. Given a distribution of charges, the total force '''F''' on a stationary charge ''q'' is the sum of the forces due to the individual charges. Thus, the electric field '''E''' of the charge distribution can be defined as '''F'''/''q'', in the limit as the size of the particle tends to zero</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The electric and magnetic fields are related in the sense that curl (local rotation) of either contributes to the rate of change of the other, and conversely. Thus, a moving electric charge induces a magnetic field and a moving magnet produces an electric field. The total electromagnetic force on a <del style="font-weight: bold; text-decoration: none;">charge </del>particle of charge ''q'' and velocity vector '''v''' is given by the Lorentz Force Law: '''F''' = ''q''('''E''' + '''v'''&times;'''B''').</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The electric and magnetic fields are related in the sense that curl (local rotation) of either contributes to the rate of change of the other, and conversely. Thus, a moving electric charge induces a magnetic field and a moving magnet produces an electric field. The total electromagnetic force on a <ins style="font-weight: bold; text-decoration: none;">charged </ins>particle of charge ''q'' and velocity vector '''v''' is given by the Lorentz Force Law: '''F''' = ''q''('''E''' + '''v'''&times;'''B''')<ins style="font-weight: bold; text-decoration: none;">. </ins></div></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Because the particle's velocity depends on the reference frame of the observer, but the (proper) force experienced by the particle is not, an electric field for one observer may be seen as a magnetic field for another, or vice versa</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Magnets in use ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Magnets in use ==</div></td></tr>
</table>Shironekohttp://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5392&oldid=prevMad: link2008-02-09T03:13:12Z<p>link</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:13, 9 February 2008</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The '''electromagnetic field''' describes the force on an electrically charged particle due to the presence of other charges. Because the total electromagnetic force depends both on the particle's charge and its velocity, the electromagnetic field is usually treated as the combination of separate, but related, <del style="font-weight: bold; text-decoration: none;">fields</del>: the '''electric field''' is the force per charge on a stationary test particle, while the '''magnetic field''' determines the contribution due to the particle's velocity.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The '''electromagnetic field''' describes the force on an electrically charged particle due to the presence of other charges. Because the total electromagnetic force depends both on the particle's charge and its velocity, the electromagnetic field is usually treated as the combination of separate, but related, <ins style="font-weight: bold; text-decoration: none;">[[force field]]s</ins>: the '''electric field''' is the force per charge on a stationary test particle, while the '''magnetic field''' determines the contribution due to the particle's velocity.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Electric charge can be either positive or negative. Particles with charges of the same sign repel each other, while particles with charges of opposite signs attract, with the magnitude of the force given by Coulomb's Law:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Electric charge can be either positive or negative. Particles with charges of the same sign repel each other, while particles with charges of opposite signs attract, with the magnitude of the force given by Coulomb's Law:</div></td></tr>
</table>Madhttp://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5387&oldid=prevShironeko: Rewritten introduction (still needs work).2008-02-09T01:17:43Z<p>Rewritten introduction (still needs work).</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:17, 9 February 2008</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">An </del>'''<del style="font-weight: bold; text-decoration: none;">Electromagnetic </del>field''' <del style="font-weight: bold; text-decoration: none;">is </del>the force <del style="font-weight: bold; text-decoration: none;">between particles possessing charge. There are two types </del>of charges<del style="font-weight: bold; text-decoration: none;">, designated positive and negative</del>. <del style="font-weight: bold; text-decoration: none;"> Particles with </del>the <del style="font-weight: bold; text-decoration: none;">same </del>charge <del style="font-weight: bold; text-decoration: none;">repel each other while particles </del>of <del style="font-weight: bold; text-decoration: none;">opposite </del>charge <del style="font-weight: bold; text-decoration: none;">attract. The magnets people are familiar with are </del>due to <del style="font-weight: bold; text-decoration: none;">[[polarize|polarizing]] </del>the <del style="font-weight: bold; text-decoration: none;">mass of the object, most often iron</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The </ins>'''<ins style="font-weight: bold; text-decoration: none;">electromagnetic </ins>field''' <ins style="font-weight: bold; text-decoration: none;">describes </ins>the force <ins style="font-weight: bold; text-decoration: none;">on an electrically charged particle due to the presence </ins>of <ins style="font-weight: bold; text-decoration: none;">other </ins>charges. <ins style="font-weight: bold; text-decoration: none;">Because the total electromagnetic force depends both on </ins>the <ins style="font-weight: bold; text-decoration: none;">particle's </ins>charge <ins style="font-weight: bold; text-decoration: none;">and its velocity, the electromagnetic field is usually treated as the combination </ins>of <ins style="font-weight: bold; text-decoration: none;">separate, but related, fields: the '''electric field''' is the force per </ins>charge <ins style="font-weight: bold; text-decoration: none;">on a stationary test particle, while the '''magnetic field''' determines the contribution </ins>due to the <ins style="font-weight: bold; text-decoration: none;">particle's velocity</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">The equation for calculating </del>the force <del style="font-weight: bold; text-decoration: none;">from a </del>given <del style="font-weight: bold; text-decoration: none;">charge is </del>Coulomb's <del style="font-weight: bold; text-decoration: none;">law</del>:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Electric charge can be either positive or negative. Particles with charges of the same sign repel each other, while particles with charges of opposite signs attract, with the magnitude of </ins>the force given <ins style="font-weight: bold; text-decoration: none;">by </ins>Coulomb's <ins style="font-weight: bold; text-decoration: none;">Law:</ins></div></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">:[[Image</ins>:<ins style="font-weight: bold; text-decoration: none;">Coulomb's Law.png]],</ins></div></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">where ''q<sub>1</sub>'' and ''q<sub>2</sub>'' are the charges, ''r'' is the distance between them, and ''&epsilon;<sub>0</sub>'' is the [[physical constant|permittivity of free space]].</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[Image:Coulomb's Law.png]]</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The electric </ins>and <ins style="font-weight: bold; text-decoration: none;">magnetic fields </ins>are <ins style="font-weight: bold; text-decoration: none;">related in the sense that curl (local rotation) of either contributes to </ins>the <ins style="font-weight: bold; text-decoration: none;">rate of change </ins>of the <ins style="font-weight: bold; text-decoration: none;">other, and conversely. Thus</ins>, <ins style="font-weight: bold; text-decoration: none;">a moving electric charge induces a magnetic field and a moving magnet produces an electric field. The total electromagnetic force on a charge particle of charge ''q'' </ins>and <ins style="font-weight: bold; text-decoration: none;">velocity vector '''v''' </ins>is <ins style="font-weight: bold; text-decoration: none;">given by </ins>the <ins style="font-weight: bold; text-decoration: none;">Lorentz Force Law</ins>: <ins style="font-weight: bold; text-decoration: none;">'''F''' = ''q''</ins>(<ins style="font-weight: bold; text-decoration: none;">'''E''' + '''v'''&times;'''B'''</ins>)<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">where q1 </del>and <del style="font-weight: bold; text-decoration: none;">q2 </del>are the <del style="font-weight: bold; text-decoration: none;">respective charges </del>of the <del style="font-weight: bold; text-decoration: none;">two particles</del>, <del style="font-weight: bold; text-decoration: none;">r is the distance between them </del>and <del style="font-weight: bold; text-decoration: none;">ε0 </del>is the <del style="font-weight: bold; text-decoration: none;">electric constant</del>: <del style="font-weight: bold; text-decoration: none;"> 8.854E-12 C²/</del>(<del style="font-weight: bold; text-decoration: none;">N*m²</del>)</div></td><td colspan="2"></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Magnets in use ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Magnets in use ==</div></td></tr>
</table>Shironekohttp://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5306&oldid=prevDarth Servo at 20:33, 8 February 20082008-02-08T20:33:41Z<p></p>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">A </del>'''<del style="font-weight: bold; text-decoration: none;">Magnetic </del>field''' is the force between particles possessing charge. There are two types of charges, designated positive and negative. Particles with the same charge repel each other while particles of opposite charge attract. The magnets people are familiar with are due to [[polarize|polarizing]] the mass of the object, most often iron.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">An </ins>'''<ins style="font-weight: bold; text-decoration: none;">Electromagnetic </ins>field''' is the force between particles possessing charge. There are two types of charges, designated positive and negative. Particles with the same charge repel each other while particles of opposite charge attract. The magnets people are familiar with are due to [[polarize|polarizing]] the mass of the object, most often iron.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The equation for calculating the force from a given charge is Coulomb's law:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The equation for calculating the force from a given charge is Coulomb's law:</div></td></tr>
</table>Darth Servohttp://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5303&oldid=prevDarth Servo: Magnetic field moved to Electromagnetic field2008-02-08T20:33:20Z<p><a href="/wiki/index.php?title=Magnetic_field" class="mw-redirect" title="Magnetic field">Magnetic field</a> moved to <a href="/wiki/index.php?title=Electromagnetic_field" title="Electromagnetic field">Electromagnetic field</a></p>
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<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:33, 8 February 2008</td>
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</td></tr></table>Darth Servohttp://www.stardestroyer.net/wiki/index.php?title=Electromagnetic_field&diff=5294&oldid=prevDarth Servo: New page: A '''Magnetic field''' is the force between particles possessing charge. There are two types of charges, designated positive and negative. Particles with the same charge repel each other...2008-02-08T20:19:17Z<p>New page: A '''Magnetic field''' is the force between particles possessing charge. There are two types of charges, designated positive and negative. Particles with the same charge repel each other...</p>
<p><b>New page</b></p><div>A '''Magnetic field''' is the force between particles possessing charge. There are two types of charges, designated positive and negative. Particles with the same charge repel each other while particles of opposite charge attract. The magnets people are familiar with are due to [[polarize|polarizing]] the mass of the object, most often iron.<br />
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The equation for calculating the force from a given charge is Coulomb's law:<br />
<br />
[[Image:Coulomb's Law.png]]<br />
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where q1 and q2 are the respective charges of the two particles, r is the distance between them and ε0 is the electric constant: 8.854E-12 C²/(N*m²)<br />
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== Magnets in use ==<br />
Most people are familiar with simple horseshoe and bar magnets, and the magnets they stick on their refrigerator. A compass is made from a small free-spinning magnet that aligns itself with the Earth's own magnetic field.<br />
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Electromagnets are created by sending an electric current through a coil of wire that produces a magnetic field. They are often used in construction.<br />
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Moving a magnet through a coil of conducting wire can achieve the reverse effect. To generate electricity, a magnet is spun in the coil and a current is generated. Metal detectors operate on a similar principle. As a piece of metal passes through the detector, it generates a current and the alarm goes off.<br />
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[[Category: Science]]</div>Darth Servo