The magnetic field as a separate phenomenon doesn't exist. It's merely a mask concealing electrical interaction. Look at familiar phenomena from the perspective of relativity, and the picture turns upside down: magnetism ceases to be anything special, turning into electricity, seen from a different angle and in a different frame of reference.
0:00 Introduction
1:27 A Long Current-Carrying Wire: A Classic Example
4:54 Relativistic Length Contraction
7:12 An Electric Field That Never Existed
9:21 Magnetic Force as a Manifestation of Electrical Interaction
12:00 Maxwell's Equations and the Theory of Relativity
14:56 Why Magnetism Isn't Just an Illusion
17:55 Why We Need to Know All This
Sources:
Magnetism is Explained as a Relativistic Effect
https://physics.stackexchange.com/que...
Relativistic Length Contraction and Changes in Charge Density
https://arxiv.org/abs/2108.07169
Classical Electromagnetism and Special Theory Relativity
https://en.wikipedia.org/wiki/Classic...
Maxwell's equations and the theory of relativity are inextricably linked
https://www.damtp.cam.ac.uk/user/tong...
Permanent magnets, electron spins – what physicists say
/ physics_how_does_relativity_explain_ferrom...