[求助] 理化六(磁場)
請問一下最近對磁場有興趣,所以翻一下國中課本
有一段是敘述"磁針在磁場中會受到磁力作用而偏轉,當磁針在空間中
某一點呈靜止時,磁針N極的指向即是磁針的N極在該點
所受磁力方向,也就是該點的磁場方向。
不懂的地方:磁力線切線方向跟指針平行,哪切線方向方向有正反相反方向,
我怎知道切線正,反哪一個方向為指針N極方向? 以前讀書時,
免強接受。現在,想知道為什麼。謝謝
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