如图所示，在磁场中，一通电导线AB被弹簧悬挂着，在水平位置上处于静止状态，当开关断开后，则

题干

如图所示，在磁场中，一通电导线AB被弹簧悬挂着，在水平位置上处于静止状态，当开关断开后，则（　　）

A：弹簧的长度增大

B：弹簧的长度减小

C：弹簧的长度不变

D：弹簧受到一个扭力作用而转过一个角

上一题下一题 0.0难度选择题更新时间:2017-07-12 09:45:51

C

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