[問題] 一題物理

作者: LSJ1111 (ROGERLO)   2019-08-26 18:01:08
https://i.imgur.com/hVOgdYF.jpg
如圖,接上開關後,甲端因電流磁效應感應成S極,想請問軟鐵棒乙端為何是N極呢?

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