两根通电直导线平行放置,电流分别为I1和I2,电流方向如图所示,

两根通电直导线平行放置,电流分别为I1和I2,电流方向如图所示,且I1>I2在与导线垂直的平面上有a、b、c、d四点,其中a、b在导线横截面连线的延长线上,c、d在导线连线的垂直平分线上。则导体中的电流在这四个点产生的磁感应强度可能为零的是:(    )

A.a点        B.b点        C.c点        D.d点

答案

B


解析:

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