如图所示,两轻质闭合金属圆环,穿挂在一根光滑水平绝缘直杆上,

如图所示,两轻质闭合金属圆环,穿挂在一根光滑水平绝缘直杆上,原来处于静止状态。当条形磁铁的N极自右向左插入圆环时,两环的运动情况是:

A同时向左运动,两环间距变大

B同时向左运动,两环间距变小;

C同时向右运动,两环间距变大

D同时向右运动,两环间距变小

答案

 B 

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