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如图，请标出通电螺线管的N、S极；
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10·达州如图13所示是小张同学在研究通电螺线管极性时的情形请标出通电螺线管的N.S.极和螺线管中的
如图所示开关闭合后螺线管通电产生磁场位于螺线管右则的小磁针会发生偏转请画出通电螺线管的N.S.极并用
螺线管通电后小磁针静止时如图8所示请在图中标出通电螺线管的N.S.极并标出电源的正负极
螺线管通电后小磁针静止时指向如图所示请在图中标出通电螺线管的N.S.极并标出电源的正负极
如图所示请根据通电螺线管的磁感线方向在图上标出螺线管及小磁针N.S.极并标出电源的+﹣极.
如图所示请根据通电螺线管的N.S.极标出小磁针N.极通电螺线管的磁感线方向以及电源的正负极.
通电螺线管通电时小磁针指向如图所示请标出螺线管的N.极和电源的正负极
如图是闭合开关S.后小磁针静止在螺线管旁的情况请标出通电螺线管的N.极和小磁针的N.极.
通电螺线管通电时小磁针指向如图所示请标出通电螺线管的N.极和电源的正极
如图22所示请根据通电螺线管周围磁感线方向判断并标出通电螺线管的N.极小磁针的N.极和电源的＋－极
请正确画出右上方图中通电螺线管上导线的绕法并标出通电螺线管的N.S.极
1根据图13中通电螺线管的磁感线方向标出小磁针的N.极以及线圈中电流的方向2小磁针在如图14所示的位
如图所示闭合开关S.后小磁针静止在螺线管旁的情况请标出通电螺线管的N.极和小磁针的N.极
如图乙所示小磁针静止在通电螺线管右侧请标出通电螺线管的N.级磁感线方向和小磁针的N.极
如图所示已知通电螺线管周围的一条磁感线的方向请标出电源+﹣极和螺线管的N.S.极.
请根据通电螺线管周围磁感线方向判断并标出通电螺线管的N.极小磁针的N.极和电源的＋－极
请根据通电螺线管周围磁感线方向判断并标出通电螺线管的N.极小磁针的N.极和电源的＋－极
放在通电螺线管旁的磁针静止时的指向如图所示标出通电螺线管的N.极S.极以及电源的+一极
如图所示开关闭合后螺线管通电产生磁场位于螺线管右则的小磁针会发生偏转请画出通电螺线管的N.S.极并用
如图所示请根据通电螺线管的N.S.极标出小磁针N.极通电螺线管的磁感线方向以及电源的正负极.
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