(11电磁感应)9 自感和涡流(原卷)
自感和涡流【自感现象的判断】1、在如图电路中,L为一个自感系数很大、直流电阻不计的线圈,D1、D2是两个完全相同的灯泡,E是一内阻不计的电源,下列说法正确的是()A.闭合开关S瞬间,灯泡D1、D2同时亮,且D2的亮度大于D1B.闭合开关S一段时间后,D1不亮、D2比刚闭合S时亮度大C.断开开关S,经过D1的电流方向沿图示方向D.断开开关S,D2闪亮一下2、如图所示,用电流传感器研究自感现象电源内阻不可忽略,线圈的自感系数较大,其直流电阻小于电阻的阻值。时刻闭合开关,电路稳定后,时刻断开,电流传感器连接计算机分别描绘了整个过程线圈中的电流和电阻中的电流随时间变化的图像。下列图像中可能正确的是( ...
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