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retupmoc

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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

I understand why the field must be along the x-axis but why does (d

I understand why the field must be along the x-axis but why does (d

**l**x**r**)x become dlrsin(alpha)? alpha doesn't seem to be the angle between the d**l**and**r**, d**l**x**r**would equal |d**l**||**r**|sin(x) where x would be the angle between the d**l**and**r**. My problem is x and alpha don't seem to be the same angle so i don't know how to advance with this problem. Any help?
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