What is the difference between the magnetic circuit of a strong magnet and the physical characteristics of the circuit？

The main differences between the physical properties of magnetic circuits and electrical circuits are as follows:
(1) There are good conductive materials in nature, and there are also materials that are insulating to the current. For example, the resistivity of copper is 1.69×10-2Qmm2/m, while the resistivity of rubber is about 10 times higher. But until now, no material insulated against magnetic flux has been found. The magnetic permeability of bismuth, which has the smallest magnetic permeability, is 0. 99982μ . The magnetic permeability of air is 1. 000038μ . Therefore air can be seen as the material with the lowest magnetic permeability. The relative permeability of ferromagnetic materials with the best permeability is about the sixth power of 10.

(2)Current is actually the flow of charged masses in a conductor. Due to the existence of conductor resistance, the electrodynamic force does work on the charged masses and consumes energy, and the power loss is converted into heat. The magnetic flux does not represent the motion of any mass, nor does it represent the power loss, so this analogy is treacherous. The circuit and the magnetic circuit are seemingly separate, and each has its own unquestionable object kissing reasoning within the bundle. This analogy is lame because of the loss of power. The circuit and the magnetic circuit are seemingly different, and each has its own unasked physical connotation.