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Is This True?? Answered

I read somewhere?? that to put fridge magnet on the side of a fridge causes it to use more power. (Magnets are OK on the front).

Is this true? If it is.....; why?

Tags:Magnets

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Jack A Lopez

Best Answer 9 years ago

There is a phenomenon called magnetic damping, based on Lenz's Law .  A conductor moving relative to a magnetic field can develop internal eddy currents, which produce a magnetic field of their own, which opposes the original field that created it.   Like moving friction, kinetic energy is absorbed and converted into heat.  But unlike friction, the magnet and the conductor don't have be touching,  just close enough for the fields to interact.

You kinda have to see it to believe it, if you haven't seen it before:
http://www.youtube.com/watch?v=pcVG6c_OvYU
http://www.youtube.com/watch?v=Bkbdm66UQis

Anyway,  it is probably the phenomenon of magnetic damping which forms the basis for the legend you describe.  The legend itself is probably false, since an ordinary refrigerator magnet is not going to have a field large enough to penetrate deep into the moving parts of the fridge, no matter where on the fridge you place it.

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Z..

9 years ago

Holy Mackerel!!

That kind of technical knowledge is way beyond my capacity to understand. But your last line I do!

Thanks for that Jack.

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Z..

9 years ago

Good grief! Four days!