What is spin? *(Veritasium)*

So, we have an electron—it has charge and a magnetic dipole moment, essentially a tiny magnet. The term *spin* (which means "rotation" in English) isn’t ideal, but it stuck. In classical physics, imagine a charged particle (like a negatively charged one) spinning like a top—it generates a magnetic field, creating a magnetic moment. So this particle behaves like a dipole with a specific direction. But *spin* is purely a quantum property, appearing only when solving Dirac equations (a relativistic framework). Thus, spin has *nothing* to do with the electron’s charge. This becomes clear if you look at a neutron—it has spin too, but no charge. You can’t say it’s rotating and creating a dipole like an electron or proton. It lacks charge, yet still has spin, just like those particles. *(Example: A solenoid—current flows in, exits, creating a strong magnetic field B₀ aligned accordingly.)*