Torqueless Solenoid Description
The torqueless solenoid is composed of two sets of solenoids nested together, with a certain number of coil turns in each group of coils and a certain current direction. The magnetic field outside the solenoid is rapidly attenuated and the total magnetic moment of the coil is zero. The main features of the \ solenoid are that it will not produce magnetic interference in the environment outside a certain distance, will not magnetize the magnetic material near it, especially the magnetic shielding layer, and the mutual influence is reduced to negligible levels. Additionally, a magnetic coil field can be used in the magnetic shielding cylinder.