Magnetic Fields visualisation

When I was at a school we ‘learnt’ about magnetic fields in what felt like hundreds of physics lessons. We’d be given a load of iron filings and some magnets and make a great big grey mess of the science labs. People would try and wash the filings off with tap water, which didn’t work and so every desk was wet and metally. I’m not sure what it taught me, a visualisation like this excellent video may have helped a little more (or even explained why my massive speakers do funny things to my monitor):

Magnetic Movie from Semiconductor on Vimeo.

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