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> 在同一铁芯上绕着两个线圈A、B，两电源相同，单刀双掷开关原来接在点1，现在把它从点l扳向点2，如图所示，试判断在此过程中，在电阻R上的电流方向是（） A．先由P→Q，再由Q→P B．先由Q→P，再由P→Q C．始终由Q→P D．始终由P→Q

问题：

发布时间：2024-09-12

在同一铁芯上绕着两个线圈A、B，两电源相同，单刀双掷开关原来接在点1，现在把它从点l扳向点2，如图所示，试判断在此过程中，在电阻R上的电流方向是（）

A．先由P→Q，再由Q→P
B．先由Q→P，再由P→Q
C．始终由Q→P
D．始终由P→Q

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