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## Homework Statement

A wire is reeled on a ring (radii [tex]R_{1}[/tex] and [tex]R_{2}[/tex]). Find the induction of a magnetic field in the middle of the ring, if there is a current I through the wire and there are N waps. Waps are reeled very tightly in only 1 layer.

## Homework Equations

[tex]H=\frac{IN}{l}[/tex]

[tex]B=\mu H[/tex]

## The Attempt at a Solution

I tried to think about the ring as about one wap of a coil, however I have no idea how to figure out a current inside the ring. I also do not really understand in which part of this construction I should look for induction.