如附图所示, 无限长的直导线在[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 点弯成半径为[tex=0.786x1.0]AOSTmhvIsOwsdZlGoks7dg==[/tex] 的圆环, 则当通以电流[tex=0.5x1.0]3EF1VcotinZAjtQqtSWaxw==[/tex] 时, 圆心 [tex=0.786x1.0]5SeCOJOzMwSNbX8MGx2Qsg==[/tex]处的磁感应强度大小等于 ()[img=253x146]17f6dec6a6400a5.png[/img] 未知类型:{'options': ['[tex=2.071x2.429]IWiQISyDT0G7PyQ/37oBFl0+b5a5G7DWUQ/1YGHSP94=[/tex]', '[tex=1.643x2.429]IWiQISyDT0G7PyQ/37oBFgETLAkBwvyMlczdLZGcx4g=[/tex]', '[tex=5.429x2.786]IWiQISyDT0G7PyQ/37oBFnS05+krzk8HwJp6BOmUl7FoEv+o+ibM/p2yuO5pDsNaKkZ1K1R4t7ekuRwr/eYxdQ==[/tex]', '[tex=5.429x2.786]IWiQISyDT0G7PyQ/37oBFnNrzkjYl+p6I3+bdN48iJTixMgo6jSglgvQ6n9We0CEXFwLeNSd2Gq9+TDWCXrwhw==[/tex]'], 'type': 102}
如附图所示, 无限长的直导线在[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 点弯成半径为[tex=0.786x1.0]AOSTmhvIsOwsdZlGoks7dg==[/tex] 的圆环, 则当通以电流[tex=0.5x1.0]3EF1VcotinZAjtQqtSWaxw==[/tex] 时, 圆心 [tex=0.786x1.0]5SeCOJOzMwSNbX8MGx2Qsg==[/tex]处的磁感应强度大小等于 ()[img=253x146]17f6dec6a6400a5.png[/img] 未知类型:{'options': ['[tex=2.071x2.429]IWiQISyDT0G7PyQ/37oBFl0+b5a5G7DWUQ/1YGHSP94=[/tex]', '[tex=1.643x2.429]IWiQISyDT0G7PyQ/37oBFgETLAkBwvyMlczdLZGcx4g=[/tex]', '[tex=5.429x2.786]IWiQISyDT0G7PyQ/37oBFnS05+krzk8HwJp6BOmUl7FoEv+o+ibM/p2yuO5pDsNaKkZ1K1R4t7ekuRwr/eYxdQ==[/tex]', '[tex=5.429x2.786]IWiQISyDT0G7PyQ/37oBFnNrzkjYl+p6I3+bdN48iJTixMgo6jSglgvQ6n9We0CEXFwLeNSd2Gq9+TDWCXrwhw==[/tex]'], 'type': 102}
1