[問題] 基本電學-電磁
請問下圖39題的磁場方向跟電流方向怎麼判斷呢?
我知道題目是發電機,應該遵循右手定則,但我看不出磁場方向...無法決定電流方向...
再麻煩各位大神解惑,感恩
http://i.imgur.com/DqqFJY6.jpg
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