一道sat2物理a compass is placed to the west of a vertical conductor .when the electron pass through the conductor,the north pole of compass needle is deflected to point toward the south.the direction of the conventional current in the conductor i
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一道sat2物理a compass is placed to the west of a vertical conductor .when the electron pass through the conductor,the north pole of compass needle is deflected to point toward the south.the direction of the conventional current in the conductor i
一道sat2物理
a compass is placed to the west of a vertical conductor .when the electron pass through the conductor,the north pole of compass needle is deflected to point toward the south.the direction of the conventional current in the conductor is 不会用右手定则判断 为什么是向上 怎么判断
一道sat2物理a compass is placed to the west of a vertical conductor .when the electron pass through the conductor,the north pole of compass needle is deflected to point toward the south.the direction of the conventional current in the conductor i
应该是导体和指南针 空间的位置比较不好理解吧.
画一个俯视图.导线在中间位置,电流流出还是流进未知（题目的要求）,指南针在西边.
通电导线的磁场方向,是根据右手螺旋来判断的.大拇指是电流方向,其他四指握成拳头,手指的绕向,就是磁场的方向.
由于指南针指向西边,手指应该是逆时针绕的,大拇指向上.
所以电流方向向上,也就是图中,电流应该是从纸里面流向人的.