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範例:載流長直導線與圓線圈的磁場

如圖所示,在一平面上有一導線彎成U型,其中PQST為極長導線,QRS為半徑a的半圓,當導線上通以I的電流後,O點之磁場大小為何?[87中聯]


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Posted in 電流產生的磁場.

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