A simple electromagnet is behind the ubiquitous solenoid, a device that can operate anything from an automatic car-door lock to a giant hydraulic robot arm. Wrap some wire around a tube, turn on the juice and watch a plunger go in and out, or anything else you like.
By: Kathy Ceceri, Edited by: David Cornish
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via Wired.co.uk
http://www.wired.co.uk/magazine/archive/2013/02/how-to/how-to-make-a-robotic-solenoid
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