如图所示电路,线圈L的电阻和电池的内电阻可以忽略,两电阻的阻值都是R,电键S原来打开着,电流<img data-fr-image-pasted="true" width="58" src="data:image/png;base64,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" class="fr-fic fr-dii">。现闭合电键将一电阻短路,于是线圈中有自感电动势产生,这自感电动势将<img data-fr-image-pasted="true" width="147" src="data:image/png;base64,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" class="fr-fic fr-dii">
A、有阻碍电流的作用,最后电流由I减小为零
B、有阻碍电流的作用,最后电流总小于I
C、有阻碍电流增大的作用,因而电流保持为I不变
D、有阻碍电流增大的作用,但电流最后还要增到2I
发布时间:2025-08-24 03:03:10