Magnetic field, Invisible region around a magnet where its force can act, Field lines, Run from the North pole to the South pole, Strongest field, Shown where field lines bunch close together, Three-dimensional field, A magnet's field surrounds it on every side, Field strength and distance, Strongest at the surface and fades quickly with distance, Combining magnetic fields, Opposite poles strengthen, matching poles push apart, Electromagnet, Magnet made by current in coiled wire around iron, Bunched field lines, Mean the magnetic field is stronger

Magnetic Fields

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