residual magnetic field

例句：

1. 1.The magnetized iron filings are attracted to the nearby magnet.
   被磁化的铁屑会被附近的磁铁吸引。
2. 2. The residual magnetic field in the room is strong enough to affect electronic devices.
   房间里的剩余磁场足够强，足以影响电子设备。
3. 3. The researchers found that the residual magnetic field from the old transformer was causing interference with the new one.
   研究人员发现，旧变压器产生的剩余磁场干扰了新变压器。