Pat wrote:
> I don't remember what it is called, but it is used to demonstrate
> magnetic coupling. An AC voltage is placed across one of the coils (I
> think the terminals on the base) and an AC volt meter is placed across
> the terminals on the top. As the core (rod in the center) is withdrawn
> the voltage reading will decrease.
Sounds reasonable, though I can't think of any useful application for
it. The effect is just simple inductance, or inductive coupling. Maybe
it's some science fair or classroom type of demo device?
-Wayne
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