9.如图所示为两根互相平行的通电导线a�b的横截面图a�b的电流方�已在图中标出.那么导线a中电流产生的磁场的磁感线环绕方�及导线b所受的 Template




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tomski9.如图所示为两根互相平行的通电导线a�b的横截面图a�b的电流方�已在图中标出.那么导线a中电流产生的磁场的磁感线环绕方�及导线b所受的 coloring