论文部分内容阅读
一、磁体磁极间的相互作用规律要点点拨:(1)磁体两端磁性最强(磁极).(2)磁极间相互作用规律是:同名磁极相互排斥,异名磁极相互吸引.(3)判断物体有无磁性的方法:①根据磁体的性质判断.即看物体能否吸引铁、钴、镍等铁磁性物质,若能吸引则它具有磁性.②根据指南北的性质判断.将条形物体悬挂在水平面内使其自由转动,若拨动后静止时总指向南北,则可判断它有磁性;且指南的一端为 S 极,指北的为 N 极.③根据磁极间相互作用规律判断.把被测物体悬挂起来,然后拿一根条形磁体靠近被测物体的某一端,若
First, the interaction between the magnetic poles of magnets Points to dial: (1) The magnetic ends of the magnet are the strongest (poles). (2) The interaction between the poles is: the magnetic poles of the same name are mutually exclusive and the magnetic poles of different names attract each other. (3) Judgment The method of object magnetism is as follows: 1 Judging from the properties of the magnet. That is to say whether the object can attract ferromagnetic materials such as iron, cobalt, nickel, etc. If it attracts, it has magnetic property. 2 Judging according to the nature of the guideline North. Suspension in the horizontal plane to make it free to rotate, if it is always north-south, then it can be judged to be magnetic; and one end of the guide is S pole, and the north is N pole. 3 It is judged according to the interaction law between magnetic poles. Hang the object under test, and then take a bar magnet near one end of the measured object.