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"Write the charge density of a ring."

...and that's it.

I know it would probably be ρ as a function of the radius. But I don't know how to move forward. I was looking through the early section in Griffith's E&M Ch. 3 (That's where we are now) and it's roughly covering Laplace's Equation...so I think I need to start there, but I dunno.

I'm confused because it doensn't ask for a specific point of reference like you would ordinarily get in a general E&M problem.