电流的磁效应是丹麦物理学家在1820年�现的通电螺线管附�的小磁针静止时n极的指�如图所示则螺线管的b端是极电源的b端是极．——青 Sketch Coloring Page

电流的磁效应是丹麦物理学家在1820年�现的通电螺线管附�的小磁针静止时n极的指�如图所示则螺线管的b端是极电源的b端是极．——青 Template

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tomski电流的磁效应是丹麦物理学家在1820年�现的通电螺线管附�的小磁针静止时n极的指�如图所示则螺线管的b端是极电源的b端是 coloring

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