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Jan 9, 2015 at 0:41 comment added Ed Krohne I'm thrilled that I inspired an investigation. I actually got into a conversation with the president of the company that sold me the electromagnets (APW company) and he told me that the magnet was a resistor and no kick would be measurable. I'm not about to argue with him, but that sounds tough to imagine. I still haven't managed to gain access to a scope, but I do measure a small, brief negative voltage when I move a weak magnet away from the electromagnet.
Dec 22, 2014 at 10:35 history edited sweber CC BY-SA 3.0
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Dec 21, 2014 at 5:17 vote accept Ed Krohne
Dec 5, 2014 at 13:36 comment added George Herold I like it (+1) and it's what I was going to answer. One thing you could do is to measure the inductance of the activated coil both with and without the iron plate in place. you'd then have a number for delta L. Then the unknown is how fast the plate is removed. That's a bit of a guesstimate... but one could try some different numbers.. 1ms maybe?
Dec 5, 2014 at 13:11 history answered sweber CC BY-SA 3.0