magnetism is just electricity with relativity? - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 15, 2018, 03:05:29 am
content: I'm not a quantum physicist so I have no way to verify if that's correct, but if it is, then magnetism is just an abstraction of the relativistic effects of moving charges?

author: lordvader88
author_rank: Frequent Contributor
timestamp: June 15, 2018, 06:37:16 am
content: Well special relativity comes into play and keeps track of 'relative' motions, and how that determines the apparent magnetic field. A relativistic Lorentz force I guess?And in some part of the math and Gauge theory, it works out just fine because...IDK anymore but it was something like u take the derivative of the (grad(of a scalar field)) and that is zero, and the velocity part of this is in that scalar field, so ....IDK the math details anymore but .....it worked out quite nice.Look up Clifford algebra and electromagnetism .Now why does nature act like that or mirror the math we humans us on this...no one knows.

author: lordvader88
author_rank: Frequent Contributor
timestamp: June 15, 2018, 06:54:10 am
content: Something like in the 'vector potential field equations' that the velocity between the charge, there is a term whose derivative is always zero, and the velocity part was in that so math wise it also cancells out or balance's out or whatever.I have to go learn this stuff again, it's been a while.Wish I knew Lagrangian and Hamiltonian mechanics a lot more, but not yet, I have video games.

author: TerraHertz
author_rank: Super Contributor
timestamp: June 15, 2018, 09:06:34 am
content: Quote from: RoGeorge on June 15, 2018, 07:17:26 amCare to explain how? Unless you're going to get pedantic about the difference between 'flowing' and 'moving'.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 15, 2018, 10:29:44 am
content: Indeed, it generalizes: any field that has the same characteristics, also has a complementary magnetic equivalent.So for example, gravitation comes with the gravitomagnetic effect and gravity waves.Tim

author: RoGeorge
author_rank: Super Contributor
timestamp: June 15, 2018, 04:24:53 pm
content: Quote from: TerraHertz on June 15, 2018, 09:06:34 amWhat I was thinking about initially was that the electron's spin (in permanent magnets) is not exactly a moving charge, but this is very debatable, and I realized that I don't have enough quantum physics knowledge/understanding in order to explain 'how'. Not sure if the 'how' answer exists as we speak (as in why there is charge, or spin, or if a distribution probability of an electron around nucleus can be viewed as a moving charge, and so on).Long story short, I decided to take it back, and delete my previous message.Thanks for the question.

author: rfeecs
author_rank: Frequent Contributor
timestamp: June 15, 2018, 04:53:39 pm
content: This "problem" with Maxwell's Equations was pointed out by Einstein in the beginning of his original paper on special relativity "On the Electrodynamics of Moving Bodies":http://hermes.ffn.ub.es/luisnavarro/nuevo_maletin/Einstein_1905_relativity.pdfQuoteThe problem is in some situations whether you have a magnetic force or an electric force depends on your frame of reference. Special relativity can explain this.The problem is demonstrated in the first 5 minutes of this video:https://youtu.be/BFLUa0ciMjw