Sat, 19/Aug/2017 23:59

Magnet trick

I am stoked. I saw today a really cool magnetic "trick". I hadn't thought about it before but all the law of electro-magnetism verify what I saw.

Imagine a foot long aluminum pipe. It is not magnetic, a magnet does not stick to it, right? Well, with a powerful rare-earth magnet you can make it look like it is working. Drop the powerful magnet into the pipe. What will happen? Drop straight through? Suspend itself and not fall? or something in between.

The in betweeners have it. What happens is that the magnet slowly falls through the pipe. 

A moving magnetic field (falling magnet) creates a moving electric field. This in turn creates an opposing magnetic field, pushing up on the falling magnet and slowing the effects of gravity. 

When I saw this I imagined all kinds of things like elevators instead of just a dumby counter weight could use a magnet to either create some electricity as the elevator moves up and down or use it to slow the decent of an elevator. All kinds of idea pooped through the head and now their gone. 

I am a firm believer that there is not much better than seeing physics in action. 





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