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    第二节自感与互感一、自感现象当线圈中电流发生变化时,线圈中的磁通量发生变化,在线圈中产生自感电动势。 二、自感系数L线圈的磁通量与线圈中的电流 I 成正比。定义:自感系数自感系数为线圈中磁通量与线圈中的电流之比。亨利,H三、自感电动势由法拉第电磁感应定律可知:而当线圈自感系数不变时,自感电动势例:一长直螺线管,线圈密度为 n,长度为 l,横截面积为 S,插有磁导率为 ? 的磁介质,求线圈的自感系数

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