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1 一体三个磁极的现象笔者在初二年级“磁体和磁极”的课堂教学中,用长磁针演示指向性时,发现该磁针(以下简称样品)不指南以为是样品失磁,取下样品放在演示台上(台上有散铁屑),当再次启用样品
1 The phenomenon of one of three magnetic poles In the classroom teaching of the magnets and magnetic poles in the second and second grades, when the author demonstrated the directivity with a long magnetic needle, he found that the magnetic needle (hereinafter referred to as the sample) did not guide to assume that the sample was demagnetized and the sample was removed. On the demonstration stage (with scattered iron swarf on the stage) when the sample is again enabled