We may receive a commission on purchases made from links. There is, perhaps, not a single device in the tool box of the Average Joe that gets used quite as much as the trusty screwdriver. The handy ...
As in an electromagnet, yes.<BR><BR>Lets say I have a small steel cylinder which is 5mm in diameter, and 5mm in length. I wrap a wire around it and apply current. How much power (or current or ...
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