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教材对通电螺线管周围的磁场是这样叙述的: 通电螺线管外部的磁场和条形磁铁的磁场一样.理解它,应注意以下几点: 1.对概念的理解要到位(1)两个原则①同名磁极相互排斥,异名磁极相互吸引. ②右手定则. (2)三个因素
The teaching material describes the magnetic field around the energizing solenoid as follows: The magnetic field outside the energized solenoid is the same as that of the bar magnet. To understand it, the following points should be noted: 1. The concept must be understood (1) Two The principle 1 magnetic pole of the same name is mutually exclusive and the magnetic poles of different names attract each other. 2 Right-hand rule. (2) Three factors