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If there's a current flowing through a very long, thick cylindrical wire and the current density is not homogenous but is proportional to how far you are from the cylinder's axis (J=ks)

What's the strength of the magnetic field as a function of how far you are from the wire?

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Ampere's Law... – Chris Gerig Dec 7 '11 at 1:41
Hi Rebel - have you tried it yourself? What concept is giving you trouble? The way you've written it right now, you're basically asking us to do a calculation for you, which is not what this site is for. If you edit the question to focus on a conceptual issue, though, I'll be happy to reopen it. – David Zaslavsky♦ Dec 7 '11 at 1:44

closed as too localized by David Zaslavsky♦ Dec 7 '11 at 1:40

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