Just a quick question about finding the magnetic induction field B on the axis of a circular coil shown on page 7 on http://www.physics.gla.ac.uk/~dland/ELMAG305/Elmag305txt5.pdf [Broken](adsbygoogle = window.adsbygoogle || []).push({});

I understand why the field must be along the x-axis but why does (dlxr)x become dlrsin(alpha)? alpha doesnt seem to be the angle between the dlandr, dlxrwould equal |dl||r|sin(x) where x would be the angle between the dlandr. My problem is x and alpha dont seem to be the same angle so i dont know how to advance with this problem. Any help?

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# Homework Help: Biot Savart

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