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# [femm] Comparing inductance predictions: femm vs standard formula

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- Subject: [femm] Comparing inductance predictions: femm vs standard formula
- From: Dan Haronian <Dan.Haronian@siband.com>
- Date: Fri, 26 Dec 2003 11:36:50 +0200
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Hi David I wonder if you could help me with the following question: Self inductance of wire with rectangular cross section is given by 2*L[Ln(2*L/(w+t)+0.5+0.22*(w+t)/L] L is the length of the inductor, W and t are the width and height. I was expecting to see the inductance to go to zero when w or t go to zero but this is not the case. Do you have a more accurate equation? Thanks Dan Haronian Israel

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