通电螺线管内部与管口外部相比,哪里的磁感应强度比较大?
人气：151 ℃ 时间：2020-03-23 05:07:21
解答
内部
你见过通电螺线管的磁力线图片吗?
磁力线是内外部连续的闭合曲线,内部密集,外部稀疏
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