This paper reaffirms the basic agreement of the material space theory: (1) Space is a physical existence; (2) "Force" is the action to space, and "force" is equal to the reciprocal value of "time"; in the absence of special description, "force" is the reciprocal of time; (3) There is a steady velocity field in three-dimensional space, whose intensity is the speed of light C; (4) Mass is a property of space produced by force acting on space, there are one-dimensional to four-dimensional masses in the universe, which correspond to velocities, light, electricity and gravitational masses; (5) The "causality principle" of physical changes; (6) The "simplicity principle" of physical changes; (7) The micro world and the macro world follow the same legal system. In this paper, magnetic field and electric field are defined respectively from space vector and space curvature. Studied the properties of magnetic and electric fields. This paper studies the properties of magnetic and electric fields, and in the field of micro electromagnetic interaction are described. Based on the basic principle of the material space theory, this paper proposes a method to calculate the spin magnetic moment of electrons and protons by using the magnetic field strength, and calculates the spin magnetic moment of protons and electrons under specific parameters. The calculated spin magnetic moment of the proton is 4.04035412*10-26J/T, it is close to the reported value of 1.41049964*10-26J/T, the spin magnetic moment of electrons is 6.69044591*10-27 J/T, which is far from the reference value of 9.28674762*10-24J/T, However, if the radius of the electron charge is set as 1.553794368*10-15m, the spin magnetic moment of the electron will be consistent with the reported value in the literature. The research results show that when the magnetic moment of elementary particles is known, the spatial structure of the charge of elementary particles can be calculated by using the method in this paper. This also provides an experimental method to verify the correctness of the proposed method.
Key words: Space vector, space curvature, magnetic moment, spin, electron, proton.
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