Timeline for What is the relation between electric magnets and permanent magnets?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 21, 2017 at 4:12 | comment | added | HolgerFiedler | There was a question about “How do I understand Electromagnetism”. Perhaps it’s helpful for you to read this answer. | |
| Sep 20, 2017 at 18:37 | comment | added | CR Drost | Well the world has a curious property that if you accelerate in a certain direction you see clocks tick faster in front of you or slower behind you, in proportion to their distance from you. This turns out to leave invariant a certain distance measure called the "interval" between two events in spacetime. As a result a certain definition of your velocity is as a 4-vector with a fixed length, and if the magnitude is fixed that can only be because the 4-force must always be perpendicular to the 4-velocity. The magnetic field tweaks the 4-force to make this happen. | |
| Sep 20, 2017 at 8:37 | comment | added | user56834 | I see. How then is the difference generated? | |
| Sep 19, 2017 at 18:37 | answer | added | NotMe | timeline score: 1 | |
| Sep 19, 2017 at 15:35 | comment | added | CR Drost | The difference is not "generated by strange quantum effects" however one of the leading "electrical currents" is in fact a "strange quantum effect": it is that electrons have an intrinsic angular momentum in space, called their "spin". For example in the ground state of the hydrogen atom, those electrons in those $s$-orbitals have zero orbital angular momentum: they aren't "orbiting" in the classical sense. However they have nonzero total angular momentum because they have this intrinsic spin angular momentum. | |
| Sep 19, 2017 at 15:25 | answer | added | user16035 | timeline score: 0 | |
| Sep 19, 2017 at 15:12 | history | edited | user56834 | CC BY-SA 3.0 |
added 77 characters in body
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| Sep 19, 2017 at 14:35 | history | asked | user56834 | CC BY-SA 3.0 |