On the Positions of the Equivalent Poles in a Magnetized Bar Tested by the Magnetometer Method

According as the two coils used in the magnetometer method are in the same axis or in parallel, two equations showing the relations of the equivalent distance between two poles to the distance between the magnetometer and the magnetized bar were deduced, and using the values of free magnetism in a soft iron bar determined by T. Yoshida and H. Kadooka, the positions of the equivalent poles were calculated. It was found that the positions of the equivalent poles were remarkably influenced by the distance between the magnetometer and the magnetized bar, and by the intensity of external field