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例1 如图1所示,试判断放在通电螺线管内的小磁针N极的指向。 错解:用安培定则先判定出通电螺线管右端是N极,左端是S极,再根据“同名磁极相互排斥,异名磁极相互吸引”,判断出小磁针的N极指向左方. 分析:两个磁体之间的相互作用可根据“同名磁极相互排斥,异名磁极相互吸引”的规律来
Example 1 As shown in Figure 1, try to determine the orientation of the N pole of the small magnetic needle placed in the energized solenoid. Misunderstanding: With ampere determination, the right end of the energized solenoid is determined to be the N pole, and the left end is the S pole. According to “the magnetic pole of the same name is mutually exclusive and the magnetic poles of different names attract each other,” the N pole of the small magnetic needle is judged to the left. Analysis: The interaction between the two magnets can be based on the law that the magnetic poles of the same name repel each other and magnetic poles of different names attract each other.