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well here is the problem...

What is the maximum current that a wire can carry if an experimenter is performing an experiment 0.60 m away that deals with the Earth's magnetic field (4.5*10-5 T), which she wishes to measure to +/- 1 percent?

i thought I could just plug the #'s given into

B = (4pi*10^-7)I / (2(pi)R)

and i ended up with 135 A...which seemed muuuuuuuuch too high...and assumably was wrong....

(4.5*10^-5) = (4pi*10^-7)I / 2(pi)(.6??)

It would be greatly appreciated if i could get this help tonight...but I just want to understand what I'm doing wrong for the most part...