We are introduced to the magnetic field as a way to keep track of the force that arises from lenght contraction in special relativity. a moving distribution of charge becomes more dense in the right frame. so in a way, the magnetic field is just the e-field. however, when i glance over the physics of permanent magnets, it is said that their magnetic field arises from the integral sum of their electrons with aligned spin(which generates a magnetic moment).spin is quantized fundamental property of elementary particles, analoguous(but not the same as) angular momentum of rotation.(point like particles don't rotate).so what is the magnetic field? how do these two views are reconciled?

[05.02] what is the best explanation of the kinetic molecular theory as it relates to the energy of the molecules in the states of matter? (1 point) the molecules in a gas have greater kinetic energy than those in a liquid, which in turn have greater kinetic energy than the molecules in a solid. kinetic energy cannot be created nor destroyed, and, as a result, all states of matter have the same kinetic energy. the molecules in a gas have greater kinetic energy; therefore, they are more tightly packed than the molecules in either a liquid or a solid. the molecules in gases and liquids, in constant motion, have greater kinetic energy than those in a solid, which do not move or vibrate because their position is fixed.