磁场汇聚、发散、平移旋转（自陈余忠老师）

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• Offline Activity (.zip)

• GeoGebra Files

  1. Applet 1 (.ggb)
     
  2. Applet 2 (.ggb)
     
  3. Applet 3 (.ggb)
     
  4. Applet 4 (.ggb)