Watches, Warnings & Advisories for Sunflower Co.

Wednesday, December 21, 2011

Wizardry: a great demonstration of Lenz’s Law!An induced...

From The NW7US Beacon:

Wizardry: a great demonstration of Lenz’s Law!

An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux.

As the magnet moves through the copper pipe, an excellent conductor of electricity, the magnet is inducing a current in the pipe, in turn creating a secondary magnetic field that opposes the movement of the magnet down the pipe. This secondary field causes the magnet to slowly fall through the pipe.

Here is an explanation of Lenz’s Law:

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