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## Homework Statement

Consider a circular ring of wire of radius a that resides in the x-y plane through the origin. The center of the ring coincides with the origin and you can regard the thickness of the wire to be infinitesimal.

a. Given that a current I flows in the ring, find an expression for the current density J.

## Homework Equations

∫B(r).dl = μ∫J(r).da

## The Attempt at a Solution

ok, I know J(r)=Io * δ(x)*δ(y)

**z**

How do I get this in cylindrical coordinates (ρ,θ,z)?