题目

如图所示，一根条形磁铁与导线环在同一平面内，磁铁中心恰与环中心重合．为了在环中产生感应电流，磁铁应（    ）                                                                                                                                                                                                                                                   　   A．  向右平动 　   B．  向左平动 　   C．  N极向外、S极向内转动 　   D．  绕垂直于纸面且过O点的轴转动                                                                                                                                         答案：C

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