Abstract:

 Based on the electromagnetic induction method，the distribution of Helmholtz coil

magnetic field under different capacitance parameters is measured by the improved method of

achieving resonance with the Helm- holtz coil in series，and the relationship between the magnetic

field of Helmholtz coil and the position of central axis is analyzed by using Origin software. The

experimental results show that the accuracy of the magnetic field of Helm- holtz coil measured by

the improved method is higher than that by the traditional electromagnetic induction method to a

certain extent. Among the three capacitor options，when the series capacitance is 0.099×10-⁶ F，the

accuracy is the highest. The fitted relationship between the magnetic field of Helmholtz coil and the

position of the central ax- is is basically consistent with the theoretical formula. The experimental effect of the improved method is obvious，the accuracy is high，and it is scientifically feasible. It is an improved method for measuring the magnetic field of Helm- holtz coils that is worth popularizing.

Key words: Helmholtz coil, law of electromagnetic induction, magnetic field distribution