• 2022-06-01
    真空中两根很长的相距为2d的平行直导线与电源组成闭合回路如图15-2所示。已知导线中的电流为I, 则在两导线正中间某点P处的磁能密度为[img=149x230]17dc720d86272a3.png[/img]
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  • 举一反三