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#Electrodynamics

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The Krononaut Moon Project 🌑<p>&nbsp;<br>Richard Feynman talks about light. 6-min. </p><p>❛❛ For his contributions to the development of <a href="https://me.dm/tags/quantum" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>quantum</span></a> <a href="https://me.dm/tags/electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electrodynamics</span></a>, <a href="https://me.dm/tags/Feynman" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Feynman</span></a> received the <a href="https://me.dm/tags/NobelPrize" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NobelPrize</span></a> in <a href="https://me.dm/tags/Physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Physics</span></a> in 1965 jointly with Julian Schwinger and Shin'ichirō Tomonaga. ❜❜ <a href="https://me.dm/tags/Wikipedia" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Wikipedia</span></a> </p><p>🔗 <a href="https://www.youtube.com/watch?v=FjHJ7FmV0M4" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=FjHJ7FmV0M</span><span class="invisible">4</span></a> 2007 Nov 02 <br>🔗 <a href="https://Wikipedia.org/wiki/Richard_Feynman" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">Wikipedia.org/wiki/Richard_Fey</span><span class="invisible">nman</span></a> … <a href="https://me.dm/tags/RichardFeynman" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RichardFeynman</span></a> <br>🔗 <a href="https://Wikipedia.org/wiki/Light" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">Wikipedia.org/wiki/Light</span><span class="invisible"></span></a> … <a href="https://me.dm/tags/Light" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Light</span></a> </p><p><a href="https://me.dm/tags/Community" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Community</span></a> <a href="https://me.dm/tags/TimeTravel" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TimeTravel</span></a> <a href="https://me.dm/tags/Research" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Research</span></a> <a href="https://me.dm/tags/quanta" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>quanta</span></a> <a href="https://me.dm/tags/theory" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>theory</span></a> <a href="https://me.dm/tags/Kronodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Kronodon</span></a></p>
tomsharp<p>In 1917, Albert Einstein established the theoretical possibility of masers and lasers. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Poetry</span></a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>History</span></a> <a href="https://mastodon.sdf.org/tags/Electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Electrodynamics</span></a> <a href="https://mastodon.sdf.org/tags/Lasers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Lasers</span></a> <a href="https://mastodon.sdf.org/tags/Masers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Masers</span></a> <a href="https://mastodon.sdf.org/tags/Einstein" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Einstein</span></a> (<a href="https://sharpgiving.com/thebookofscience/items/p1917.html" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">sharpgiving.com/thebookofscien</span><span class="invisible">ce/items/p1917.html</span></a>)</p>
tomsharp<p>In 1912, Reginald Fessenden demonstrated the first successful sonar. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Poetry</span></a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>History</span></a> <a href="https://mastodon.sdf.org/tags/Electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Electrodynamics</span></a> <a href="https://mastodon.sdf.org/tags/Sonar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sonar</span></a> <a href="https://mastodon.sdf.org/tags/Fessenden" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Fessenden</span></a> (<a href="https://sharpgiving.com/thebookofscience/items/p1912b.html" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">sharpgiving.com/thebookofscien</span><span class="invisible">ce/items/p1912b.html</span></a>)</p>
ƧƿѦςɛ♏ѦਹѤʞ<p>Does a freely falling charge radiate?<br><a href="https://www.youtube.com/watch?v=1QsaLSpSPq4" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=1QsaLSpSPq</span><span class="invisible">4</span></a><br><a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a> <a href="https://mastodon.social/tags/maths" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>maths</span></a> <a href="https://mastodon.social/tags/electricity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electricity</span></a> <a href="https://mastodon.social/tags/electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electrodynamics</span></a> <a href="https://mastodon.social/tags/relativity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>relativity</span></a></p>
Adam Denoon<p><span class="h-card" translate="no"><a href="https://fediscience.org/@ekmiller" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>ekmiller</span></a></span> Oh My Various Goddess Abstractions. This is so incredibly beautiful 😍<br>STDP reveals that timing reshapes connections.<br>This paper reveals how, and it's... musical.</p><p>The brain as an "instrument" takes on new meaning.</p><p><a href="https://bcs.mit.edu/news/brain-networks-encoding-memory-come-together-electric-fields-study-finds" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">bcs.mit.edu/news/brain-network</span><span class="invisible">s-encoding-memory-come-together-electric-fields-study-finds</span></a></p><p><a href="https://universeodon.com/tags/neuroscience" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neuroscience</span></a> <a href="https://universeodon.com/tags/neurobuzz" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neurobuzz</span></a> <a href="https://universeodon.com/tags/cogsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cogsci</span></a> <a href="https://universeodon.com/tags/neurons" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neurons</span></a> <a href="https://universeodon.com/tags/music" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>music</span></a> <a href="https://universeodon.com/tags/electricity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electricity</span></a> <a href="https://universeodon.com/tags/energy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>energy</span></a> <a href="https://universeodon.com/tags/fieldtheory" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fieldtheory</span></a> <a href="https://universeodon.com/tags/electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electrodynamics</span></a> <a href="https://universeodon.com/tags/instrument" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>instrument</span></a></p>
Project Gutenberg<p>Wilhelm Eduard Weber died <a href="https://mastodon.social/tags/OTD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OTD</span></a> in 1891.</p><p>He was a German physicist and, together with Carl Friedrich Gauss, inventor of the first electromagnetic telegraph, which connected the observatory with the institute for physics in Göttingen.</p><p>The first usage of the letter "c" to denote the speed of light was in an 1856 paper by Kohlrausch and Weber (Elektrodynamische Maassbestimmungen). The SI unit of magnetic flux, the weber (symbol: Wb) is named after him. via <span class="h-card"><a href="https://mstdn.social/@Wikipedia" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>Wikipedia</span></a></span> </p><p><a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://mastodon.social/tags/electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electrodynamics</span></a></p>
j_bertolotti<p>Short story time:<br>When I was doing my PhD, we had in the lab an old Argon laser (which we used to pump a Ti:Sapphire, for those familiar with lasers). If you have never seen one, Argon lasers are massive, can output a ton of power, and eat a crazy amount of current, so much that the laser had its own dedicated industrial pentaphase plug.<br>I don't remember how many Amperes of current flew in those cables. What I remember is that, when you turned on the switch in the morning, the change in current (from zero to whatever the steady state value was) was enough to make the cable shake.<br>This happens because the electromagnetic field inside and around the cable stores momentum, and so it kicked the cable when building up.<br>I am not sure that laser still exists, and I have never been able to find a video of a cable shaking when the current is switched on, but it would be great to have such a video when teaching electrodynamics (and in particular how momentum and angular momentum can be stored in an electromagnetic field).<br><a href="https://mathstodon.xyz/tags/ITeachPhysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ITeachPhysics</span></a> <a href="https://mathstodon.xyz/tags/Physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Physics</span></a> <a href="https://mathstodon.xyz/tags/Electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Electrodynamics</span></a> <a href="https://mathstodon.xyz/tags/Laser" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Laser</span></a></p>
Guillermo Rubilar<p>Hi everyone!. I have been on Mastodon for a couple of years but never did a proper <a href="https://mastodon.social/tags/introduction" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>introduction</span></a>. So here it goes...</p><p>I am Guillermo, a <a href="https://mastodon.social/tags/physicist" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physicist</span></a> from <a href="https://mastodon.social/tags/Chile" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Chile</span></a> working at the University of Concepción, mainly interested in General Relativity.</p><p>I typically teach <a href="https://mastodon.social/tags/GR" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GR</span></a>, <a href="https://mastodon.social/tags/Electrodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Electrodynamics</span></a>, <a href="https://mastodon.social/tags/MathPhys" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathPhys</span></a> and also Linux+LaTeX+Python for first year students.</p><p>I will be posting mainly about <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a>, <a href="https://mastodon.social/tags/python" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>python</span></a>, <a href="https://mastodon.social/tags/LaTeX" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LaTeX</span></a> and <a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a>, both in English and in Spanish. I can also communicate in German and Portuguese.</p>