This is part of a serie of 12 videos to introduce self-excited dynamo action.
Video #4 of 12
Magnetism can however be generated, in the absence of any permanent magnet, by electrical currents. This was pointed out by Hans Christian Oersted in 1820. A current in a wire affects the compass needle just as a magnet. In fact by winding the wire in a coil, we produce a field very similar to that of a bar magnet.
This experiment establishes a direct connection between electricity and magnetism.
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