在研究电磁感应现象的实验中所用的器材如图15所示它们是直流电源线圈b�动变阻器用来控制电流以改变磁场强弱 试按实验的要求在实物图 Template




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tomski在研究电磁感应现象的实验中所用的器材如图15所示它们是直流电源线圈b�动变阻器用来控制电流以改变磁场强弱 试按实验的要求在实物图 coloring