This is the circuit in question:(adsbygoogle = window.adsbygoogle || []).push({});

http://www.atnetzwerk.de/temp/windung.gif [Broken]

There is an infinitely long isolated conductor and at one point it has a twist in the shape of a circle. Now I am supposed to find the strength of the magnetic field in the center of the twist when there's a current I applied to the conductor.

I know that [tex]H = \frac{I}{2r}[/tex] for the magnetic field at the center of a ring, but how does the infinitely long conductor come into place here? If I just take the conductor without the ring I could use [tex]H = \frac{I}{2 \pi r}[/tex], but that doesn't really help either.

My question is, how do I incorporate the infinitely long conductor into the equation?

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# Homework Help: Magnetic field question

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