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| Thoughts about Special and General Relativity from a Classical Perspective |
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| TimFox:
SI is an international convention to define units of measure. Physics makes use of SI units, but the fundamental axioms and theorems are defined by SI. Because the results are more repeatable than the obvious definition, the meter is now defined by SI in terms of a defined value for speed of light in vacuum and the second in terms of a cesium transition. Before this change, the meter was defined in terms of an optical-transition wavelength, and the speed of light was to be measured. Again, the important thing about changes in SI unit definitions is to progress towards more repeatable calibrations in different laboratories. |
| kevin original:
Welp, turns out the magnetic field isn't real. I just learned/realized/allowedmyselftoaccept that magnetism is a mathematical field because the true source is relativistic activity from changing electric field. At least the electric field is physical/real for now? It annoyingly vindicates Ken Wheeler's single dielectric field theory. Ken would probably have some good ideas if only he knew what he was talking about. I can't really blame him considering Eric Dollard is his source of electrical theory. I'm passive aggressively stirring the pot in case there are any Ken/Eric fans out there. Their ideas and terminology may be wrong but you can't blame a guy for starting with a logical conceptual explanation and then working from there. The thing is, you shouldn't just dismiss Einstein and the current scientific thought out of spite. Another guy I found uses the youtube handle "ask us whatever". I like that he actually uses the math to justify his views. I agree that length contraction doesn't make any real sense but he has some other misconceptions out of the gate that I don't agree with. I agree that the speed of light changes, but only in a gravitational field or conductor of light/electricity but not in a vacuum. |
| TimFox:
Light propagates through an optical fiber, or through a pipe filled with gas at a slower speed than in vacuum. The speed ratio is called the "optical index", or "index of refraction", and is used in lens design. This is well-documented, understood, and exploited in technology. 'What is "real"?', said jesting Pilate, and would not stay for an answer. [sorry] The magnetic force between two conductors carrying current is measurable and palpable. This is a usual starting point for the discussion of magnetic fields in physics. |
| kevin original:
--- Quote from: aetherist on December 08, 2022, 08:41:32 pm --- --- Quote from: kevin original on November 30, 2022, 06:31:45 am ---What gets me is that the Coulomb is not considered an SI base unit, instead the Ampere is the base unit and the Coulomb is a derived unit from the Ampere being Amps times seconds. Shows how much faith they have in their own definitions. If you were doing a dimensional analysis and using Ampere in place of Coulomb then you wouldn't realize there is a hidden second dimension in there screwing with your intuition. --- End quote --- U should google Ivor Catt re his electricity theory. Allso Forrest Bishop. --- End quote --- I briefly looked up these two. I can't say I'm convinced about the trapped wave idea between plates of a capacitor, surly it would cause excess heating and energy dissipation in the capacitor over time? I like the idea that the TEM wave takes 2 steps forward and 1 step back in a transmission line but I have a cognitive bias justifying the slowing of light rather than just moving it back and forth quickly. Thanks for the ideas. |
| TimFox:
Fields: In classical mechanics, a field is a mathematical description of the force exerted on a test object as a function of position, etc. The gravitational field gives the force on a mass. The electric (electrostatic) field gives the force on a charge. The magnetic field gives the force on a current. In all these cases, the forces are real and can be both measured and sensed. The fields calculated by the usual physical equations agree with experience in the range where classical physics is appropriate. The reason why magnetic fields are far more important in electrical machinery (motors, etc.) than are electric fields is that you can use the same current over and over by running it through a coil. |
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