如图,水平放罝的直导线正下方有一只可自由转动的小磁针.当导线

如图,水平放罝的直导线正下方有一只可自由转动的小磁针.当导线中通过自右向左的电流时,小磁针N极的转动情况是

A.垂直于纸面向里转 

B.垂直于纸面向外转

C.在纸面内顺时针转

D.在纸面内逆时计转

答案

B

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