i am looking for an equation (integral) , so that i can predict what width to make a coil of wire , of certain length ,and thickness, so that it comes out to an outer diameter of 1.5" with an inner diameter of .5"..(adsbygoogle = window.adsbygoogle || []).push({});

i usually spend my time in the engineering section , but i thought that i would come to you , with this question..

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# Need Equation

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