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在图中标出通电螺线管的N极和B点的电流方向.
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如图所示某同学用右手螺旋定则判断通电螺线管的磁极请你在图中标出导线中的电流方向和螺线管的N.S.极
当给螺线管通电时小磁针N.极的指向如图所示试上图中标出螺线管的极性及电流方向
请在图中标出电流方向和通电螺线管的N.极.
当给螺线管通电时螺线管的N.S.极如图所示请在图中标出电流方向和小磁针静止时的N.S.极
根据通电螺线管中的电流方向在图中标出通电螺线管的N.极和磁感线的方向.
根据通电螺线管中的电流方向在图中标出电源的正负极和通电螺线管的N.S.极.
在图中标出了通电螺线管的N极请在图中分别标出通电螺线管的电流方向和静止在通电螺线管周围小磁针的N极
当螺线管通电时螺线管的N.S.极如图所示请在图中标出电流的方向和小磁针静止时的N.S.极.
根据通电螺线管中的电流方向在图中标出电源的正负极和通电螺线管的N.S.极
在图中根据通电螺线管旁小磁针静止时的指向标出通电螺线管的N.S.极和电流方向
1根据磁感线方向在下图中标出磁铁及小磁针的N.S.极2在通电螺线管左方有一小磁针小磁针静止时的指向如
当螺线管通电时螺线管的N.S.极如图5-1-25所示请在图中标出电流的方向和小磁针静止时的N.S.极
请你在图所示的通电螺线管中标出电流的方向和螺线管的N.S.极
小磁针在通电螺线管右端静止时的指向如右图所示请在图中标出通电螺线管的N.S.极电流的方向和电源的正负
10·南允根据图中已给出的电流方向在图中标出通电螺线管的N.S.极和磁感线的方向
根据通电螺线管的N.极请在图中标出电流方向小磁针的N.极和磁感线的方向.
在图中标出通电螺线管的电流方向和它的N.极
通电螺线管下方自由转动的小磁针静止后如图11所示请在图中标出螺线管的N.S.极和螺线管中的电流方向.
当给螺线管通电时小磁针N.极的指向如图所示试在图中标出螺线管的极性及电流方向
请在图中标出电流方向和通电螺线管的N.极.
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