What are eddy currents and why do they make a magnet fall slowly through a copper pipe

Neodymium ring magnet on 15mm copper pipe

 

Magnets are fascinating – there are many things about magnets for which the only explanation seems to be magic! The best place to find out about magnet-related phenomena is of course here, on our blog – and YouTube. The most viewed videos showing super-strong magnets falling through copper pipes alone have amassed an incredible 8 million views and counting.

What you are seeing in these videos is of course a demonstration of eddy currents in action. Here we will explain what is going on.

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How to magnetise a screwdriver

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If you are trying to fix a screw in a hard to reach place or are working with small, fiddly screws a magnetised screwdriver can save you lots of time. Most new, high-end screwdrivers are supplied already magnetised, but sometimes they can lose their magnetism. There are a number of ways you can use magnets to remagnetise a screwdriver, or magnetise one that was never magnetised in the first place.

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