Electromagnets are another kind of magnet. Unlike the rare earth or
ceramic magnets, electromagnets require the input of electricity in
order for them to work. The great thing about electromagnets is you can
turn the magnetic field on and off with the flip of a switch. You've
probably seen pictures of electromagnets at work in salvage yards onTV shows and magazines, where a big crane hosts this large flat disk and picks up scrap metal
and releases it into a bin or rail car. They come in all different
sizes from the huge industrial behemoths to the small hobby sizes that
you can do experiments with. I recently found a set of 4 hobby electromagnets on eBay for 30 bucks, each one will pick up 14 lbs for every volt of electricity put into it.
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