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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Apr 2008 17:04:11 IST
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magnetic field due to a point in the coil at a distance 2r from the centre = mu * di / 2r
where di is the current throught that element
di = i * d r / (b-a)
where dr is the thickness of a very small part
dB = mu * i * d r / 2r * (b-a)
integrating we have
mu * i/2(b-a) * ln(b/a)
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