Watch has a component called gossamer, this thing is most afraid of watch in the magnetic field near a magnet, spring will be magnetized.

手表里有个部件叫游丝，这东西最怕的就是磁场，手表在靠近磁铁后，游丝会被磁化。

youdao

Based on the spatial distribution of magnetic dipole, the equation of the normal component of leakage magnetic field on the tube surface under low-intensity field was derived.

根据磁偶极子空间磁场分布，导出了在外部垂直方向弱磁场下管状工件表面细长缺陷产生的弱磁场法向分量的计算公式。

youdao

To measure the horizontal component of geomagnetism, the "bifilar balance method" is used, together with an additional adjustable magnetic field to compensate the geomagnetic field.

采用“双悬线平衡法”，并利用外加可调磁场与地磁水平分量补偿的方法对地磁水平分量进行了测量。

youdao