This week I received a new concrete vibrator. Immediately I started to experiment with vibrating mud. It does a marvelous job liquefying stiff mud and helping it flow. When the vibrations are removed, the mud gets stiff again.
Then I noticed that the mud flows counterclockwise around the vibrating wand. There was something oddly familiar about the picture of the mud circling the wand. Finally I remembered...
It looks a lot like pictures I have seen many times in basic electricity books; it looks like a magnetic field flowing around a current carrying wire.
This has to be an analogy telling me something about why a moving electric charge creates a magnetic field. Hopefully the lesson will make itself clear in due time.
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