The intrinsic properties of soft ferrite materials are usually identified by measurement on standard rings with closed magnetic circuit.
软磁铁氧体材料的本征特性，通常用闭合磁路的标准样环测量确定。
Electromagnetic induction: when a conductor of a closed electric circuit move cutting the magnetic induction lines, the conductor produces current.
电磁感应现象：闭合电路的一部分导体在磁场里做切隔磁感线运动时，导体中就产生电流的现象。
The generation of electromotive force in a closed circuit by a varying magnetic flux through the circuit.
在一个封闭回电路里，通过改变其磁流而产生电动势。
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