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【单选题】
如图所示,是小探究“磁场对通电导体的作用”的实验装置,ab是一根金属棒,通过金属导轨连接到电路中,闭合开关后,金属棒没有运动(仪器、电路都完好),要想使金属棒运动起来,下列措施不可行的是( )A.
将蹄形磁体的N、S极对调
B.
换用磁性强一些的蹄形磁体
C.
换用能提供较大电流的直流电源
D.
使用轻质金属棒，减小金属棒与导轨之间的摩擦力
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