Junk Yard Magnets
What are they?
Everyone has seen Junk Yard Magnets in action movies. They are usually found in the villain's lair smashing stuff. The magnets are found in Junk Yards where heavy metal, mostly from cars, needs to be moved.
How do they work?
These giant machines are essentially massive electromagnets. They work as seen in the photo below.
A coil is wrapped around a solid piece of metal. Electro current is run through the coil and this generates an electromagnetic field which in turn makes metal objects attract to one end of the electromagnet and repel from the other end.
https://www.youtube.com/watch?v=Vdkac3wJ9Aw
https://www.youtube.com/watch?v=F3mY44POVEo
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