如图所示,一条形磁铁的周围放着能自由转动的小磁针甲、乙、丙、丁,这四根小磁针静止时N极指向画错的是(磁针的黑端表示N极)( )A. 磁针甲 B. 磁针乙 C. 磁针丙 D. 磁针丁 答案:【答案】C【解析】异名磁极相互吸引,磁体的外部磁感线的方向是从磁体的N极指向磁体的S极,在小磁针静止时相邻的小磁针极性是相反的。所以选C。思路分析:异名磁极相互吸引,磁体的外部磁感线的方向是从磁体的N极指向磁体的S极。( ) 4. ―What are you looking for, Michael? ―My cousin's MP3 player. It ______right here just now and now it's______! A. has been ;gone B. was ; goneC. was; going D. is; going