Characterization of the field distribution of infinite-length current-carrying solenoids

Solenoids, as a basic form of coil, are widely used in many fields such as military, economy, ecology, medical treatment, astronomy and geology, etc. Determination of the magnetic field in solenoids is a problem that electromagnetism and electrotechnology must face. This paper takes two different approximate models of solenoids as the basis, selects the appropriate research method, uses the basic theory and numerical methods to derive the magnetic field formula of solenoids, analyzes the magnetic field characteristics, and makes a multidimensional comparison of the two analytical