运动电场具有磁场特性电场与磁场的关系(2)(英文)  

MAGNETIC FIELD FEATURE OF MOVING ELECTRIC FIELD ——THE RELATIONSHIP OF MAGNETISM AND ELECTRICITY(2)

作　　者：陈有君[1] 

机构地区：[1]内蒙古农业大学生物工程系,呼和浩特010018

出　　处：《内蒙古农业大学学报（自然科学版）》2002年第1期91-97,共7页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

摘　　要：Biot- Savart定律是经典电磁学中关于电流的磁场的基本定律 ,以它为基础 ,并结合分析经典电磁学中关于磁与电关系的理论 ,推导出了磁场与电场联系的规律 ,即 :运动电场具有磁场特性。磁感应强度与电场强度之间具有如下关系 :B=1C2 (VE× E)电流的磁场是电流周围运动电场的特性 ,在传导电流的周围 ,由于正负电荷的电场强度相等 ,方向相反而抵消 ,所以没有明显的电场 ,但是随电荷运动的电场潜流 ,相反方向的电场的运动方向相反 ,因此向量 VE× E却是不平衡的 ,这个向量就是传导电流的磁场。即电流只是磁场的表面的源 ,磁场的源是运动的电场或运动的电荷。磁场与电场及运动速度之间是互相垂直的三维向量。电场的时变也是由于运动造成的 ,所以时变电场引起的磁场也是由电场的运动造成的。时变电场产生磁场不是电磁现象的一般规律。The fundamental relationship of magnetic field relates with electric field has been inferred from Biot-Savart's law,the fundamental law about the magnetic field of current,and other classical theory about the relationship of magnetism with electricity.The magnetic field induction relates with the electric field intensity by the formula of B=1C 2(V E×E) That is the moving electric field has magnetic field character,and magnetic field is related with moving electric charge or moving electric field.It is not proper to contribute the source of magnetic field only to current. There is no apparent electric field around a conduction current for the electric field caused by negative and positive charge are equal in magnitude and opposite in direction and offset each other,but opposite charge moves in opposite direction,there is no balance for the vector of V E×E,it gives magnetic feature.This is the mechanism of magnetic field of current. Time-varying electric field is caused by nonuniform electric field motion.Thus time-varying electric field causing magnetic field is also caused by electric field motion.And time-varying electric field can induce magnetic field is not a general law.Ampere's circulation theorem and Maxwell's formula on the relationship of magnetism with electricity can only be used in some special conditions.And they are unsuitable to be used in time-varying electric field condition like the circuit in the short time of switching on or switching off.

关 键 词：磁场特性 电场 磁场 运动电场 磁感应强度 电场强度 

分 类 号：O441[理学—电磁学]