Hello, I am trying to integrate(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \int \mu_0 I (dl X r) /4 \pi r^2 [/tex]

in order to get the magnetic field at a point a distance R from a wire with current I. r is the distance between the differential length and the point. I integrate over the entire wire (which becomes an angle from 0 to 2 pi).

I am off by a factor of 1/pi from the correct answer of of mu_0 I/2 pi R. Is my integral or my integration wrong?

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# Homework Help: Magnetic field around an infinitely long wire

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